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libosmocore/src/core/utils.c

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/*
* (C) 2011 by Harald Welte <laforge@gnumonks.org>
* (C) 2011 by Sylvain Munaut <tnt@246tNt.com>
* (C) 2014 by Nils O. Selåsdal <noselasd@fiane.dyndns.org>
*
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <stdbool.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <stdio.h>
#include <inttypes.h>
#include <limits.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/bit64gen.h>
/*! \addtogroup utils
* @{
* various utility routines
*
* \file utils.c */
static __thread char namebuf[255];
/* shared by osmo_str_tolower() and osmo_str_toupper() */
static __thread char capsbuf[128];
/*! get human-readable string for given value
* \param[in] vs Array of value_string tuples
* \param[in] val Value to be converted
* \returns pointer to human-readable string
*
* If val is found in vs, the array's string entry is returned. Otherwise, an
* "unknown" string containing the actual value is composed in a static buffer
* that is reused across invocations.
*/
const char *get_value_string(const struct value_string *vs, uint32_t val)
{
const char *str = get_value_string_or_null(vs, val);
if (str)
return str;
snprintf(namebuf, sizeof(namebuf), "unknown 0x%"PRIx32, val);
namebuf[sizeof(namebuf) - 1] = '\0';
return namebuf;
}
/*! get human-readable string or NULL for given value
* \param[in] vs Array of value_string tuples
* \param[in] val Value to be converted
* \returns pointer to human-readable string or NULL if val is not found
*/
const char *get_value_string_or_null(const struct value_string *vs,
uint32_t val)
{
int i;
if (!vs)
return NULL;
for (i = 0;; i++) {
if (vs[i].value == 0 && vs[i].str == NULL)
break;
if (vs[i].value == val)
return vs[i].str;
}
return NULL;
}
/*! get numeric value for given human-readable string
* \param[in] vs Array of value_string tuples
* \param[in] str human-readable string
* \returns numeric value (>0) or negative numer in case of error
*/
int get_string_value(const struct value_string *vs, const char *str)
{
int i;
for (i = 0;; i++) {
if (vs[i].value == 0 && vs[i].str == NULL)
break;
if (!strcasecmp(vs[i].str, str))
return vs[i].value;
}
return -EINVAL;
}
/*! Convert BCD-encoded digit into printable character
* \param[in] bcd A single BCD-encoded digit
* \returns single printable character
*/
char osmo_bcd2char(uint8_t bcd)
{
if (bcd < 0xa)
return '0' + bcd;
else
return 'A' + (bcd - 0xa);
}
/*! Convert number in ASCII to BCD value
* \param[in] c ASCII character
* \returns BCD encoded value of character
*/
uint8_t osmo_char2bcd(char c)
{
if (c >= '0' && c <= '9')
return c - 0x30;
else if (c >= 'A' && c <= 'F')
return 0xa + (c - 'A');
else if (c >= 'a' && c <= 'f')
return 0xa + (c - 'a');
else
return 0;
}
/*! Convert BCD to string.
* The given nibble offsets are interpreted in BCD order, i.e. nibble 0 is bcd[0] & 0xf, nibble 1 is bcd[0] >> 4, nibble
* 3 is bcd[1] & 0xf, etc..
* \param[out] dst Output string buffer, is always nul terminated when dst_size > 0.
* \param[in] dst_size sizeof() the output string buffer.
* \param[in] bcd Binary coded data buffer.
* \param[in] start_nibble Offset to start from, in nibbles, typically 1 to skip the first nibble.
* \param[in] end_nibble Offset to stop before, in nibbles, e.g. sizeof(bcd)*2 - (bcd[0] & GSM_MI_ODD? 0:1).
* \param[in] allow_hex If false, return error if there are digits other than 0-9. If true, return those as [A-F].
* \returns The strlen that would be written if the output buffer is large enough, excluding nul byte (like
* snprintf()), or -EINVAL if allow_hex is false and a digit > 9 is encountered. On -EINVAL, the conversion is
* still completed as if allow_hex were passed as true. Return -ENOMEM if dst is NULL or dst_size is zero.
* If end_nibble <= start_nibble, write an empty string to dst and return 0.
*/
int osmo_bcd2str(char *dst, size_t dst_size, const uint8_t *bcd, int start_nibble, int end_nibble, bool allow_hex)
{
char *dst_end;
int nibble_i;
int rc = 0;
if (!dst || dst_size < 1 || start_nibble < 0)
return -ENOMEM;
dst_end = dst + dst_size - 1;
for (nibble_i = start_nibble; nibble_i < end_nibble && dst < dst_end; nibble_i++, dst++) {
uint8_t nibble = bcd[nibble_i >> 1];
if ((nibble_i & 1))
nibble >>= 4;
nibble &= 0xf;
if (!allow_hex && nibble > 9)
rc = -EINVAL;
*dst = osmo_bcd2char(nibble);
}
*dst = '\0';
if (rc < 0)
return rc;
return OSMO_MAX(0, end_nibble - start_nibble);
}
/*! Convert string to BCD.
* The given nibble offsets are interpreted in BCD order, i.e. nibble 0 is bcd[0] & 0x0f, nibble 1 is bcd[0] & 0xf0, nibble
* 3 is bcd[1] & 0x0f, etc..
* \param[out] dst Output BCD buffer.
* \param[in] dst_size sizeof() the output string buffer.
* \param[in] digits String containing decimal or hexadecimal digits in upper or lower case.
* \param[in] start_nibble Offset to start from, in nibbles, typically 1 to skip the first (MI type) nibble.
* \param[in] end_nibble Negative to write all digits found in str, followed by 0xf nibbles to fill any started octet.
* If >= 0, stop before this offset in nibbles, e.g. to get default behavior, pass
* start_nibble + strlen(str) + ((start_nibble + strlen(str)) & 1? 1 : 0) + 1.
* \param[in] allow_hex If false, return error if there are hexadecimal digits (A-F). If true, write those to
* BCD.
* \returns The buffer size in octets that is used to place all bcd digits (including the skipped nibbles
* from 'start_nibble' and rounded up to full octets); -EINVAL on invalid digits;
* -ENOMEM if dst is NULL, if dst_size is too small to contain all nibbles, or if start_nibble is negative.
*/
int osmo_str2bcd(uint8_t *dst, size_t dst_size, const char *digits, int start_nibble, int end_nibble, bool allow_hex)
{
const char *digit = digits;
int nibble_i;
if (!dst || !dst_size || start_nibble < 0)
return -ENOMEM;
if (end_nibble < 0) {
end_nibble = start_nibble + strlen(digits);
/* If the last octet is not complete, add another filler nibble */
if (end_nibble & 1)
end_nibble++;
}
if ((unsigned int) (end_nibble / 2) > dst_size)
return -ENOMEM;
for (nibble_i = start_nibble; nibble_i < end_nibble; nibble_i++) {
uint8_t nibble = 0xf;
int octet = nibble_i >> 1;
if (*digit) {
char c = *digit;
digit++;
if (c >= '0' && c <= '9')
nibble = c - '0';
else if (allow_hex && c >= 'A' && c <= 'F')
nibble = 0xa + (c - 'A');
else if (allow_hex && c >= 'a' && c <= 'f')
nibble = 0xa + (c - 'a');
else
return -EINVAL;
}
nibble &= 0xf;
if ((nibble_i & 1))
dst[octet] = (nibble << 4) | (dst[octet] & 0x0f);
else
dst[octet] = (dst[octet] & 0xf0) | nibble;
}
/* floor(float(end_nibble) / 2) */
return end_nibble / 2;
}
/*! Parse a string containing hexadecimal digits
* \param[in] str string containing ASCII encoded hexadecimal digits
* \param[out] b output buffer
* \param[in] max_len maximum space in output buffer
* \returns number of parsed octets, or -1 on error
*/
int osmo_hexparse(const char *str, uint8_t *b, unsigned int max_len)
{
char c;
uint8_t v;
const char *strpos;
unsigned int nibblepos = 0;
memset(b, 0x00, max_len);
for (strpos = str; (c = *strpos); strpos++) {
/* skip whitespace */
if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
continue;
/* If the buffer is too small, error out */
if (nibblepos >= (max_len << 1))
return -1;
if (c >= '0' && c <= '9')
v = c - '0';
else if (c >= 'a' && c <= 'f')
v = 10 + (c - 'a');
else if (c >= 'A' && c <= 'F')
v = 10 + (c - 'A');
else
return -1;
b[nibblepos >> 1] |= v << (nibblepos & 1 ? 0 : 4);
nibblepos ++;
}
/* In case of uneven amount of digits, the last byte is not complete
* and that's an error. */
if (nibblepos & 1)
return -1;
return nibblepos >> 1;
}
static __thread char hexd_buff[4096];
static const char hex_chars[] = "0123456789abcdef";
/*! Convert binary sequence to hexadecimal ASCII string.
* \param[out] out_buf Output buffer to write the resulting string to.
* \param[in] out_buf_size sizeof(out_buf).
* \param[in] buf Input buffer, pointer to sequence of bytes.
* \param[in] len Length of input buf in number of bytes.
* \param[in] delim String to separate each byte; NULL or "" for no delim.
* \param[in] delim_after_last If true, end the string in delim (true: "1a:ef:d9:", false: "1a:ef:d9");
* if out_buf has insufficient space, the string will always end in a delim.
* \returns out_buf, containing a zero-terminated string, or "" (empty string) if out_buf == NULL or out_buf_size < 1.
*
* This function will print a sequence of bytes as hexadecimal numbers, adding one delim between each byte (e.g. for
* delim passed as ":", return a string like "1a:ef:d9").
*
* The delim_after_last argument exists to be able to exactly show the original osmo_hexdump() behavior, which always
* ends the string with a delimiter.
*/
const char *osmo_hexdump_buf(char *out_buf, size_t out_buf_size, const unsigned char *buf, int len, const char *delim,
bool delim_after_last)
{
int i;
char *cur = out_buf;
size_t delim_len;
if (!out_buf || !out_buf_size)
return "";
delim = delim ? : "";
delim_len = strlen(delim);
for (i = 0; i < len; i++) {
const char *delimp = delim;
int len_remain = out_buf_size - (cur - out_buf) - 1;
if (len_remain < (int) (2 + delim_len)
&& !(!delim_after_last && i == (len - 1) && len_remain >= 2))
break;
*cur++ = hex_chars[buf[i] >> 4];
*cur++ = hex_chars[buf[i] & 0xf];
if (i == (len - 1) && !delim_after_last)
break;
while (len_remain > 1 && *delimp) {
*cur++ = *delimp++;
len_remain--;
}
}
*cur = '\0';
return out_buf;
}
/*! Convert a sequence of unpacked bits to ASCII string, in user-supplied buffer.
* \param[out] buf caller-provided output string buffer
* \param[out] buf_len size of buf in bytes
* \param[in] bits A sequence of unpacked bits
* \param[in] len Length of bits
* \return The output buffer (buf).
*/
char *osmo_ubit_dump_buf(char *buf, size_t buf_len, const uint8_t *bits, unsigned int len)
{
unsigned int i;
if (len > buf_len-1)
len = buf_len-1;
memset(buf, 0, buf_len);
for (i = 0; i < len; i++) {
char outch;
switch (bits[i]) {
case 0:
outch = '0';
break;
case 0xff:
outch = '?';
break;
case 1:
outch = '1';
break;
default:
outch = 'E';
break;
}
buf[i] = outch;
}
buf[buf_len-1] = 0;
return buf;
}
/*! Convert a sequence of unpacked bits to ASCII string, in static buffer.
* \param[in] bits A sequence of unpacked bits
* \param[in] len Length of bits
* \returns string representation in static buffer.
*/
char *osmo_ubit_dump(const uint8_t *bits, unsigned int len)
{
return osmo_ubit_dump_buf(hexd_buff, sizeof(hexd_buff), bits, len);
}
/*! Convert binary sequence to hexadecimal ASCII string
* \param[in] buf pointer to sequence of bytes
* \param[in] len length of buf in number of bytes
* \returns pointer to zero-terminated string
*
* This function will print a sequence of bytes as hexadecimal numbers,
* adding one space character between each byte (e.g. "1a ef d9")
*
* The maximum size of the output buffer is 4096 bytes, i.e. the maximum
* number of input bytes that can be printed in one call is 1365!
*/
char *osmo_hexdump(const unsigned char *buf, int len)
{
osmo_hexdump_buf(hexd_buff, sizeof(hexd_buff), buf, len, " ", true);
return hexd_buff;
}
/*! Convert binary sequence to hexadecimal ASCII string
* \param[in] ctx talloc context from where to allocate the output string
* \param[in] buf pointer to sequence of bytes
* \param[in] len length of buf in number of bytes
* \returns pointer to zero-terminated string
*
* This function will print a sequence of bytes as hexadecimal numbers,
* adding one space character between each byte (e.g. "1a ef d9")
*/
char *osmo_hexdump_c(const void *ctx, const unsigned char *buf, int len)
{
size_t hexd_buff_len = len * 3 + 1;
char *hexd_buff = talloc_size(ctx, hexd_buff_len);
if (!hexd_buff)
return NULL;
osmo_hexdump_buf(hexd_buff, hexd_buff_len, buf, len, " ", true);
return hexd_buff;
}
/*! Convert binary sequence to hexadecimal ASCII string
* \param[in] buf pointer to sequence of bytes
* \param[in] len length of buf in number of bytes
* \returns pointer to zero-terminated string
*
* This function will print a sequence of bytes as hexadecimal numbers,
* without any space character between each byte (e.g. "1aefd9")
*
* The maximum size of the output buffer is 4096 bytes, i.e. the maximum
* number of input bytes that can be printed in one call is 2048!
*/
char *osmo_hexdump_nospc(const unsigned char *buf, int len)
{
osmo_hexdump_buf(hexd_buff, sizeof(hexd_buff), buf, len, "", true);
return hexd_buff;
}
/*! Convert binary sequence to hexadecimal ASCII string
* \param[in] ctx talloc context from where to allocate the output string
* \param[in] buf pointer to sequence of bytes
* \param[in] len length of buf in number of bytes
* \returns pointer to zero-terminated string
*
* This function will print a sequence of bytes as hexadecimal numbers,
* without any space character between each byte (e.g. "1aefd9")
*/
char *osmo_hexdump_nospc_c(const void *ctx, const unsigned char *buf, int len)
{
size_t hexd_buff_len = len * 2 + 1;
char *hexd_buff = talloc_size(ctx, hexd_buff_len);
if (!hexd_buff)
return NULL;
osmo_hexdump_buf(hexd_buff, hexd_buff_len, buf, len, "", true);
return hexd_buff;
}
/* Compat with previous typo to preserve abi */
char *osmo_osmo_hexdump_nospc(const unsigned char *buf, int len)
#if defined(__MACH__) && defined(__APPLE__)
;
#else
__attribute__((weak, alias("osmo_hexdump_nospc")));
#endif
#include "config.h"
#ifdef HAVE_CTYPE_H
#include <ctype.h>
/*! Convert an entire string to lower case
* \param[out] out output string, caller-allocated
* \param[in] in input string
*/
void osmo_str2lower(char *out, const char *in)
{
unsigned int i;
for (i = 0; i < strlen(in); i++)
out[i] = tolower((const unsigned char)in[i]);
out[strlen(in)] = '\0';
}
/*! Convert an entire string to upper case
* \param[out] out output string, caller-allocated
* \param[in] in input string
*/
void osmo_str2upper(char *out, const char *in)
{
unsigned int i;
for (i = 0; i < strlen(in); i++)
out[i] = toupper((const unsigned char)in[i]);
out[strlen(in)] = '\0';
}
#endif /* HAVE_CTYPE_H */
/*! Wishful thinking to generate a constant time compare
* \param[in] exp Expected data
* \param[in] rel Comparison value
* \param[in] count Number of bytes to compare
* \returns 1 in case \a exp equals \a rel; zero otherwise
*
* Compare count bytes of exp to rel. Return 0 if they are identical, 1
* otherwise. Do not return a mismatch on the first mismatching byte,
* but always compare all bytes, regardless. The idea is that the amount of
* matching bytes cannot be inferred from the time the comparison took. */
int osmo_constant_time_cmp(const uint8_t *exp, const uint8_t *rel, const int count)
{
int x = 0, i;
for (i = 0; i < count; ++i)
x |= exp[i] ^ rel[i];
/* if x is zero, all data was identical */
return x? 1 : 0;
}
/*! Generic retrieval of 1..8 bytes as big-endian uint64_t
* \param[in] data Input data as byte-array
* \param[in] data_len Length of \a data in octets
* \returns uint64_t of \a data interpreted as big-endian
*
* This is like osmo_load64be_ext, except that if data_len is less than
* sizeof(uint64_t), the data is interpreted as the least significant bytes
* (osmo_load64be_ext loads them as the most significant bytes into the
* returned uint64_t). In this way, any integer size up to 64 bits can be
* decoded conveniently by using sizeof(), without the need to call specific
* numbered functions (osmo_load16, 32, ...). */
uint64_t osmo_decode_big_endian(const uint8_t *data, size_t data_len)
{
uint64_t value = 0;
while (data_len > 0) {
value = (value << 8) + *data;
data += 1;
data_len -= 1;
}
return value;
}
/*! Generic big-endian encoding of big endian number up to 64bit
* \param[in] value unsigned integer value to be stored
* \param[in] data_len number of octets
* \returns static buffer containing big-endian stored value
*
* This is like osmo_store64be_ext, except that this returns a static buffer of
* the result (for convenience, but not threadsafe). If data_len is less than
* sizeof(uint64_t), only the least significant bytes of value are encoded. */
uint8_t *osmo_encode_big_endian(uint64_t value, size_t data_len)
{
static __thread uint8_t buf[sizeof(uint64_t)];
OSMO_ASSERT(data_len <= ARRAY_SIZE(buf));
osmo_store64be_ext(value, buf, data_len);
return buf;
}
/*! Copy a C-string into a sized buffer
* \param[in] src source string
* \param[out] dst destination string
* \param[in] siz size of the \a dst buffer
* \returns length of \a src
*
* Copy at most \a siz bytes from \a src to \a dst, ensuring that the result is
* NUL terminated. The NUL character is included in \a siz, i.e. passing the
* actual sizeof(*dst) is correct.
*
* Note, a similar function that also limits the input buffer size is osmo_print_n().
*/
size_t osmo_strlcpy(char *dst, const char *src, size_t siz)
{
size_t ret = src ? strlen(src) : 0;
if (siz) {
size_t len = OSMO_MIN(siz - 1, ret);
if (len)
memcpy(dst, src, len);
dst[len] = '\0';
}
return ret;
}
/*! Find first occurence of a char in a size limited string.
* Like strchr() but with a buffer size limit.
* \param[in] str String buffer to examine.
* \param[in] str_size sizeof(str).
* \param[in] c Character to look for.
* \return Pointer to the matched char, or NULL if not found.
*/
const char *osmo_strnchr(const char *str, size_t str_size, char c)
{
const char *end = str + str_size;
const char *pos;
if (!str)
return NULL;
for (pos = str; pos < end; pos++) {
if (c == *pos)
return pos;
if (!*pos)
return NULL;
}
return NULL;
}
/*! Validate that a given string is a hex string within given size limits.
* Note that each hex digit amounts to a nibble, so if checking for a hex
* string to result in N bytes, pass amount of digits as 2*N.
* \param str A nul-terminated string to validate, or NULL.
* \param min_digits least permitted amount of digits.
* \param max_digits most permitted amount of digits.
* \param require_even if true, require an even amount of digits.
* \returns true when the hex_str contains only hexadecimal digits (no
* whitespace) and matches the requested length; also true
* when min_digits <= 0 and str is NULL.
*/
bool osmo_is_hexstr(const char *str, int min_digits, int max_digits,
bool require_even)
{
int len;
/* Use unsigned char * to avoid a compiler warning of
* "error: array subscript has type 'char' [-Werror=char-subscripts]" */
const unsigned char *pos = (const unsigned char*)str;
if (!pos)
return min_digits < 1;
for (len = 0; *pos && len < max_digits; len++, pos++)
if (!isxdigit(*pos))
return false;
if (len < min_digits)
return false;
/* With not too many digits, we should have reached *str == nul */
if (*pos)
return false;
if (require_even && (len & 1))
return false;
return true;
}
static const char osmo_identifier_illegal_chars[] = "., {}[]()<>|~\\^`'\"?=;/+*&%$#!";
/*! Determine if a given identifier is valid, i.e. doesn't contain illegal chars
* \param[in] str String to validate
* \param[in] sep_chars Permitted separation characters between identifiers.
* \returns true in case \a str contains only valid identifiers and sep_chars, false otherwise
*/
bool osmo_separated_identifiers_valid(const char *str, const char *sep_chars)
{
/* characters that are illegal in names */
unsigned int i;
size_t len;
/* an empty string is not a valid identifier */
if (!str || (len = strlen(str)) == 0)
return false;
for (i = 0; i < len; i++) {
if (sep_chars && strchr(sep_chars, str[i]))
continue;
/* check for 7-bit ASCII */
if (str[i] & 0x80)
return false;
if (!isprint((int)str[i]))
return false;
/* check for some explicit reserved control characters */
if (strchr(osmo_identifier_illegal_chars, str[i]))
return false;
}
return true;
}
/*! Determine if a given identifier is valid, i.e. doesn't contain illegal chars
* \param[in] str String to validate
* \returns true in case \a str contains valid identifier, false otherwise
*/
bool osmo_identifier_valid(const char *str)
{
return osmo_separated_identifiers_valid(str, NULL);
}
/*! Replace characters in the given string buffer so that it is guaranteed to pass osmo_separated_identifiers_valid().
* To guarantee passing osmo_separated_identifiers_valid(), replace_with must not itself be an illegal character. If in
* doubt, use '-'.
* \param[inout] str Identifier to sanitize, must be nul terminated and in a writable buffer.
* \param[in] sep_chars Additional characters that are to be replaced besides osmo_identifier_illegal_chars.
* \param[in] replace_with Replace any illegal characters with this character.
*/
void osmo_identifier_sanitize_buf(char *str, const char *sep_chars, char replace_with)
{
char *pos;
if (!str)
return;
for (pos = str; *pos; pos++) {
if (strchr(osmo_identifier_illegal_chars, *pos)
|| (sep_chars && strchr(sep_chars, *pos)))
*pos = replace_with;
}
}
/*! Like osmo_escape_str_buf2, but with unusual ordering of arguments, and may sometimes return string constants instead
* of writing to buf for error cases or empty input.
* Most *_buf() functions have the buffer and size as first arguments, here the arguments are last.
* In particular, this function signature doesn't work with OSMO_STRBUF_APPEND_NOLEN().
* \param[in] str A string that may contain any characters.
* \param[in] len Pass -1 to print until nul char, or >= 0 to force a length.
* \param[inout] buf string buffer to write escaped characters to.
* \param[in] bufsize size of \a buf.
* \returns buf containing an escaped representation, possibly truncated,
* or "(null)" if str == NULL, or "(error)" in case of errors.
*/
const char *osmo_escape_str_buf(const char *str, int in_len, char *buf, size_t bufsize)
{
if (!str)
return "(null)";
if (!buf || !bufsize)
return "(error)";
return osmo_escape_str_buf2(buf, bufsize, str, in_len);
}
/*! Copy N characters to a buffer with a function signature useful for OSMO_STRBUF_APPEND().
* Similarly to snprintf(), the result is always nul terminated (except if buf is NULL or bufsize is 0).
* \param[out] buf Target buffer.
* \param[in] bufsize sizeof(buf).
* \param[in] str String to copy.
* \param[in] n Maximum number of non-nul characters to copy.
* \return Number of characters that would be written if bufsize were large enough excluding '\0' (like snprintf()).
*/
int osmo_print_n(char *buf, size_t bufsize, const char *str, size_t n)
{
size_t write_n;
if (!str)
str = "";
n = strnlen(str, n);
if (!buf || !bufsize)
return n;
write_n = n;
if (write_n >= bufsize)
write_n = bufsize - 1;
if (write_n)
strncpy(buf, str, write_n);
buf[write_n] = '\0';
return n;
}
/*! Return the string with all non-printable characters escaped.
* This internal function is the implementation for all osmo_escape_str* and osmo_quote_str* API versions.
* It provides both the legacy (non C compatible) escaping, as well as C compatible string constant syntax,
* and it provides a return value of characters-needed, to allow producing un-truncated strings in all cases.
* \param[out] buf string buffer to write escaped characters to.
* \param[in] bufsize sizeof(buf).
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length (also past nul chars).
* \param[in] legacy_format If false, return C compatible string constants ("\x0f"), if true the legacy
* escaping format ("\15"). The legacy format also escapes as "\a\b\f\v", while
* the non-legacy format also escapes those as "\xNN" sequences.
* \return Number of characters that would be written if bufsize were large enough excluding '\0' (like snprintf()).
*/
static int _osmo_escape_str_buf(char *buf, size_t bufsize, const char *str, int in_len, bool legacy_format)
{
struct osmo_strbuf sb = { .buf = buf, .len = bufsize };
int in_pos = 0;
int next_unprintable = 0;
if (!str)
in_len = 0;
if (in_len < 0)
in_len = strlen(str);
/* Make sure of '\0' termination */
if (!in_len)
OSMO_STRBUF_PRINTF(sb, "%s", "");
while (in_pos < in_len) {
for (next_unprintable = in_pos;
next_unprintable < in_len && isprint((int)str[next_unprintable])
&& str[next_unprintable] != '"'
&& str[next_unprintable] != '\\';
next_unprintable++);
OSMO_STRBUF_APPEND(sb, osmo_print_n, &str[in_pos], next_unprintable - in_pos);
in_pos = next_unprintable;
if (in_pos == in_len)
goto done;
switch (str[next_unprintable]) {
#define BACKSLASH_CASE(c, repr) \
case c: \
OSMO_STRBUF_PRINTF(sb, "\\%c", repr); \
break
BACKSLASH_CASE('\n', 'n');
BACKSLASH_CASE('\r', 'r');
BACKSLASH_CASE('\t', 't');
BACKSLASH_CASE('\0', '0');
BACKSLASH_CASE('\\', '\\');
BACKSLASH_CASE('"', '"');
default:
if (legacy_format) {
switch (str[next_unprintable]) {
BACKSLASH_CASE('\a', 'a');
BACKSLASH_CASE('\b', 'b');
BACKSLASH_CASE('\v', 'v');
BACKSLASH_CASE('\f', 'f');
default:
OSMO_STRBUF_PRINTF(sb, "\\%u", (unsigned char)str[in_pos]);
break;
}
break;
}
OSMO_STRBUF_PRINTF(sb, "\\x%02x", (unsigned char)str[in_pos]);
break;
}
in_pos ++;
#undef BACKSLASH_CASE
}
done:
return sb.chars_needed;
}
/*! Return the string with all non-printable characters escaped.
* \param[out] buf string buffer to write escaped characters to.
* \param[in] bufsize sizeof(buf).
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length (also past nul chars).
* \return Number of characters that would be written if bufsize were large enough excluding '\0' (like snprintf()).
*/
int osmo_escape_str_buf3(char *buf, size_t bufsize, const char *str, int in_len)
{
return _osmo_escape_str_buf(buf, bufsize, str, in_len, false);
}
/*! Return the string with all non-printable characters escaped.
* \param[out] buf string buffer to write escaped characters to.
* \param[in] bufsize sizeof(buf).
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length (also past nul chars).
* \return The output buffer (buf).
*/
char *osmo_escape_str_buf2(char *buf, size_t bufsize, const char *str, int in_len)
{
_osmo_escape_str_buf(buf, bufsize, str, in_len, true);
return buf;
}
/*! Return the string with all non-printable characters escaped.
* Call osmo_escape_str_buf() with a static buffer.
* \param[in] str A string that may contain any characters.
* \param[in] len Pass -1 to print until nul char, or >= 0 to force a length.
* \returns buf containing an escaped representation, possibly truncated, or str itself.
*/
const char *osmo_escape_str(const char *str, int in_len)
{
return osmo_escape_str_buf(str, in_len, namebuf, sizeof(namebuf));
}
/*! Return the string with all non-printable characters escaped, in dynamically-allocated buffer.
* \param[in] str A string that may contain any characters.
* \param[in] len Pass -1 to print until nul char, or >= 0 to force a length.
* \returns dynamically-allocated output buffer, containing an escaped representation
*/
char *osmo_escape_str_c(const void *ctx, const char *str, int in_len)
{
/* The string will be at least as long as in_len, but some characters might need escaping.
* These extra bytes should catch most usual escaping situations, avoiding a second run in OSMO_NAME_C_IMPL. */
OSMO_NAME_C_IMPL(ctx, in_len + 16, "ERROR", _osmo_escape_str_buf, str, in_len, true);
}
/*! Return a quoted and escaped representation of the string.
* This internal function is the implementation for all osmo_quote_str* API versions.
* It provides both the legacy (non C compatible) escaping, as well as C compatible string constant syntax,
* and it provides a return value of characters-needed, to allow producing un-truncated strings in all cases.
* \param[out] buf string buffer to write escaped characters to.
* \param[in] bufsize sizeof(buf).
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length (also past nul chars).
* \param[in] legacy_format If false, return C compatible string constants ("\x0f"), if true the legacy
* escaping format ("\15"). The legacy format also escapes as "\a\b\f\v", while
* the non-legacy format also escapes those as "\xNN" sequences.
* \return Number of characters that would be written if bufsize were large enough excluding '\0' (like snprintf()).
*/
static size_t _osmo_quote_str_buf(char *buf, size_t bufsize, const char *str, int in_len, bool legacy_format)
{
struct osmo_strbuf sb = { .buf = buf, .len = bufsize };
if (!str)
OSMO_STRBUF_PRINTF(sb, "NULL");
else {
OSMO_STRBUF_PRINTF(sb, "\"");
OSMO_STRBUF_APPEND(sb, _osmo_escape_str_buf, str, in_len, legacy_format);
OSMO_STRBUF_PRINTF(sb, "\"");
}
return sb.chars_needed;
}
/*! Like osmo_escape_str_buf3(), but returns double-quotes around a string, or "NULL" for a NULL string.
* This allows passing any char* value and get its C representation as string.
* The function signature is suitable for OSMO_STRBUF_APPEND_NOLEN().
* \param[out] buf string buffer to write escaped characters to.
* \param[in] bufsize sizeof(buf).
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length.
* \return Number of characters that would be written if bufsize were large enough excluding '\0' (like snprintf()).
*/
int osmo_quote_str_buf3(char *buf, size_t bufsize, const char *str, int in_len)
{
return _osmo_quote_str_buf(buf, bufsize, str, in_len, false);
}
/*! Like osmo_escape_str_buf2(), but returns double-quotes around a string, or "NULL" for a NULL string.
* This allows passing any char* value and get its C representation as string.
* The function signature is suitable for OSMO_STRBUF_APPEND_NOLEN().
* \param[out] buf string buffer to write escaped characters to.
* \param[in] bufsize sizeof(buf).
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length.
* \return The output buffer (buf).
*/
char *osmo_quote_str_buf2(char *buf, size_t bufsize, const char *str, int in_len)
{
_osmo_quote_str_buf(buf, bufsize, str, in_len, true);
return buf;
}
/*! Like osmo_quote_str_buf2, but with unusual ordering of arguments, and may sometimes return string constants instead
* of writing to buf for error cases or empty input.
* Most *_buf() functions have the buffer and size as first arguments, here the arguments are last.
* In particular, this function signature doesn't work with OSMO_STRBUF_APPEND_NOLEN().
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length.
* \returns buf containing a quoted and escaped representation, possibly truncated.
*/
const char *osmo_quote_str_buf(const char *str, int in_len, char *buf, size_t bufsize)
{
if (!str)
return "NULL";
if (!buf || !bufsize)
return "(error)";
_osmo_quote_str_buf(buf, bufsize, str, in_len, true);
return buf;
}
/*! Like osmo_quote_str_buf() but returns the result in a static buffer.
* The static buffer is shared with get_value_string() and osmo_escape_str().
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length.
* \returns static buffer containing a quoted and escaped representation, possibly truncated.
*/
const char *osmo_quote_str(const char *str, int in_len)
{
_osmo_quote_str_buf(namebuf, sizeof(namebuf), str, in_len, true);
return namebuf;
}
/*! Like osmo_quote_str_buf() but returns the result in a dynamically-allocated buffer.
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length.
* \returns dynamically-allocated buffer containing a quoted and escaped representation.
*/
char *osmo_quote_str_c(const void *ctx, const char *str, int in_len)
{
/* The string will be at least as long as in_len, but some characters might need escaping.
* These extra bytes should catch most usual escaping situations, avoiding a second run in OSMO_NAME_C_IMPL. */
OSMO_NAME_C_IMPL(ctx, in_len + 16, "ERROR", _osmo_quote_str_buf, str, in_len, true);
}
/*! Return the string with all non-printable characters escaped.
* In contrast to osmo_escape_str_buf2(), this returns the needed buffer size suitable for OSMO_STRBUF_APPEND(), and
* this escapes characters in a way compatible with C string constant syntax.
* \param[out] buf string buffer to write escaped characters to.
* \param[in] bufsize sizeof(buf).
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length (also past nul chars).
* \return Number of characters that would be written if bufsize were large enough excluding '\0' (like snprintf()).
*/
size_t osmo_escape_cstr_buf(char *buf, size_t bufsize, const char *str, int in_len)
{
return _osmo_escape_str_buf(buf, bufsize, str, in_len, false);
}
/*! Return the string with all non-printable characters escaped, in dynamically-allocated buffer.
* In contrast to osmo_escape_str_c(), this escapes characters in a way compatible with C string constant syntax, and
* allocates sufficient memory in all cases.
* \param[in] str A string that may contain any characters.
* \param[in] len Pass -1 to print until nul char, or >= 0 to force a length.
* \returns dynamically-allocated buffer, containing an escaped representation.
*/
char *osmo_escape_cstr_c(void *ctx, const char *str, int in_len)
{
/* The string will be at least as long as in_len, but some characters might need escaping.
* These extra bytes should catch most usual escaping situations, avoiding a second run in OSMO_NAME_C_IMPL. */
OSMO_NAME_C_IMPL(ctx, in_len + 16, "ERROR", _osmo_escape_str_buf, str, in_len, false);
}
/*! Like osmo_escape_str_buf2(), but returns double-quotes around a string, or "NULL" for a NULL string.
* This allows passing any char* value and get its C representation as string.
* The function signature is suitable for OSMO_STRBUF_APPEND_NOLEN().
* In contrast to osmo_escape_str_buf2(), this returns the needed buffer size suitable for OSMO_STRBUF_APPEND(), and
* this escapes characters in a way compatible with C string constant syntax.
* \param[out] buf string buffer to write escaped characters to.
* \param[in] bufsize sizeof(buf).
* \param[in] str A string that may contain any characters.
* \param[in] in_len Pass -1 to print until nul char, or >= 0 to force a length.
* \return Number of characters that would be written if bufsize were large enough excluding '\0' (like snprintf()).
*/
size_t osmo_quote_cstr_buf(char *buf, size_t bufsize, const char *str, int in_len)
{
return _osmo_quote_str_buf(buf, bufsize, str, in_len, false);
}
/*! Return the string quoted and with all non-printable characters escaped, in dynamically-allocated buffer.
* In contrast to osmo_quote_str_c(), this escapes characters in a way compatible with C string constant syntax, and
* allocates sufficient memory in all cases.
* \param[in] str A string that may contain any characters.
* \param[in] len Pass -1 to print until nul char, or >= 0 to force a length.
* \returns dynamically-allocated buffer, containing a quoted and escaped representation.
*/
char *osmo_quote_cstr_c(void *ctx, const char *str, int in_len)
{
/* The string will be at least as long as in_len plus two quotes, but some characters might need escaping.
* These extra bytes should catch most usual escaping situations, avoiding a second run in OSMO_NAME_C_IMPL. */
OSMO_NAME_C_IMPL(ctx, in_len + 16, "ERROR", _osmo_quote_str_buf, str, in_len, false);
}
/*! perform an integer square root operation on unsigned 32bit integer.
* This implementation is taken from "Hacker's Delight" Figure 11-1 "Integer square root, Newton's
* method", which can also be found at http://www.hackersdelight.org/hdcodetxt/isqrt.c.txt */
uint32_t osmo_isqrt32(uint32_t x)
{
uint32_t x1;
int s, g0, g1;
if (x <= 1)
return x;
s = 1;
x1 = x - 1;
if (x1 > 0xffff) {
s = s + 8;
x1 = x1 >> 16;
}
if (x1 > 0xff) {
s = s + 4;
x1 = x1 >> 8;
}
if (x1 > 0xf) {
s = s + 2;
x1 = x1 >> 4;
}
if (x1 > 0x3) {
s = s + 1;
}
g0 = 1 << s; /* g0 = 2**s */
g1 = (g0 + (x >> s)) >> 1; /* g1 = (g0 + x/g0)/2 */
/* converges after four to five divisions for arguments up to 16,785,407 */
while (g1 < g0) {
g0 = g1;
g1 = (g0 + (x/g0)) >> 1;
}
return g0;
}
/*! Convert a string to lowercase, while checking buffer size boundaries.
* The result written to \a dest is guaranteed to be nul terminated if \a dest_len > 0.
* If dest == src, the string is converted in-place, if necessary truncated at dest_len - 1 characters
* length as well as nul terminated.
* Note: similar osmo_str2lower(), but safe to use for src strings of arbitrary length.
* \param[out] dest Target buffer to write lowercase string.
* \param[in] dest_len Maximum buffer size of dest (e.g. sizeof(dest)).
* \param[in] src String to convert to lowercase.
* \returns Length of \a src, like osmo_strlcpy(), but if \a dest == \a src at most \a dest_len - 1.
*/
size_t osmo_str_tolower_buf(char *dest, size_t dest_len, const char *src)
{
size_t rc;
if (dest == src) {
if (dest_len < 1)
return 0;
dest[dest_len - 1] = '\0';
rc = strlen(dest);
} else {
if (dest_len < 1)
return strlen(src);
rc = osmo_strlcpy(dest, src, dest_len);
}
for (; *dest; dest++)
*dest = tolower(*dest);
return rc;
}
/*! Convert a string to lowercase, using a static buffer.
* The resulting string may be truncated if the internally used static buffer is shorter than src.
* The internal buffer is at least 128 bytes long, i.e. guaranteed to hold at least 127 characters and a
* terminating nul. The static buffer returned is shared with osmo_str_toupper().
* See also osmo_str_tolower_buf().
* \param[in] src String to convert to lowercase.
* \returns Resulting lowercase string in a static buffer, always nul terminated.
*/
const char *osmo_str_tolower(const char *src)
{
osmo_str_tolower_buf(capsbuf, sizeof(capsbuf), src);
return capsbuf;
}
/*! Convert a string to lowercase, dynamically allocating the output from given talloc context
* See also osmo_str_tolower_buf().
* \param[in] ctx talloc context from where to allocate the output string
* \param[in] src String to convert to lowercase.
* \returns Resulting lowercase string in a dynamically allocated buffer, always nul terminated.
*/
char *osmo_str_tolower_c(const void *ctx, const char *src)
{
size_t buf_len = strlen(src) + 1;
char *buf = talloc_size(ctx, buf_len);
if (!buf)
return NULL;
osmo_str_tolower_buf(buf, buf_len, src);
return buf;
}
/*! Convert a string to uppercase, while checking buffer size boundaries.
* The result written to \a dest is guaranteed to be nul terminated if \a dest_len > 0.
* If dest == src, the string is converted in-place, if necessary truncated at dest_len - 1 characters
* length as well as nul terminated.
* Note: similar osmo_str2upper(), but safe to use for src strings of arbitrary length.
* \param[out] dest Target buffer to write uppercase string.
* \param[in] dest_len Maximum buffer size of dest (e.g. sizeof(dest)).
* \param[in] src String to convert to uppercase.
* \returns Length of \a src, like osmo_strlcpy(), but if \a dest == \a src at most \a dest_len - 1.
*/
size_t osmo_str_toupper_buf(char *dest, size_t dest_len, const char *src)
{
size_t rc;
if (dest == src) {
if (dest_len < 1)
return 0;
dest[dest_len - 1] = '\0';
rc = strlen(dest);
} else {
if (dest_len < 1)
return strlen(src);
rc = osmo_strlcpy(dest, src, dest_len);
}
for (; *dest; dest++)
*dest = toupper(*dest);
return rc;
}
/*! Convert a string to uppercase, using a static buffer.
* The resulting string may be truncated if the internally used static buffer is shorter than src.
* The internal buffer is at least 128 bytes long, i.e. guaranteed to hold at least 127 characters and a
* terminating nul. The static buffer returned is shared with osmo_str_tolower().
* See also osmo_str_toupper_buf().
* \param[in] src String to convert to uppercase.
* \returns Resulting uppercase string in a static buffer, always nul terminated.
*/
const char *osmo_str_toupper(const char *src)
{
osmo_str_toupper_buf(capsbuf, sizeof(capsbuf), src);
return capsbuf;
}
/*! Convert a string to uppercase, dynamically allocating the output from given talloc context
* See also osmo_str_tolower_buf().
* \param[in] ctx talloc context from where to allocate the output string
* \param[in] src String to convert to uppercase.
* \returns Resulting uppercase string in a dynamically allocated buffer, always nul terminated.
*/
char *osmo_str_toupper_c(const void *ctx, const char *src)
{
size_t buf_len = strlen(src) + 1;
char *buf = talloc_size(ctx, buf_len);
if (!buf)
return NULL;
osmo_str_toupper_buf(buf, buf_len, src);
return buf;
}
/*! Calculate the Luhn checksum (as used for IMEIs).
* \param[in] in Input digits in ASCII string representation.
* \param[in] in_len Count of digits to use for the input (14 for IMEI).
* \returns checksum char (e.g. '3'); negative on error
*/
char osmo_luhn(const char* in, int in_len)
{
int i, sum = 0;
/* All input must be numbers */
for (i = 0; i < in_len; i++) {
if (!isdigit((unsigned char)in[i]))
return -EINVAL;
}
/* Double every second digit and add it to sum */
for (i = in_len - 1; i >= 0; i -= 2) {
int dbl = (in[i] - '0') * 2;
if (dbl > 9)
dbl -= 9;
sum += dbl;
}
/* Add other digits to sum */
for (i = in_len - 2; i >= 0; i -= 2)
sum += in[i] - '0';
/* Final checksum */
return (sum * 9) % 10 + '0';
}
/*! Remove up to N chars from the end of an osmo_strbuf.
* |--char-count---| - - chars_needed - - |
* |<---------drop----------|
*/
void osmo_strbuf_drop_tail(struct osmo_strbuf *sb, size_t n_chars)
{
size_t drop_n;
if (sb->pos <= sb->buf)
return;
drop_n = OSMO_MIN(sb->chars_needed, n_chars);
sb->chars_needed -= drop_n;
/* chars_needed was reduced by n_chars, which may have been entirely behind the end of a full buffer, within the
* hypothetical chars_needed. Modify the buffer tail pos only if the buffer is not or longer full now. */
if (sb->chars_needed >= OSMO_STRBUF_CHAR_COUNT(*sb))
return;
sb->pos = sb->buf + sb->chars_needed;
*sb->pos = '\0';
}
/*! Let osmo_strbuf know that n_chars characters (excluding nul) were written to the end of the buffer.
* If sb is nonempty, the n_chars are assumed to have been written to sb->pos. If sb is still empty and pos == NULL, the
* n_chars are assumed to have been written to the start of the buffer.
* Advance sb->pos and sb->chars_needed by at most n_chars, or up to sb->len - 1.
* Ensure nul termination. */
void osmo_strbuf_added_tail(struct osmo_strbuf *sb, size_t n_chars)
{
/* On init of an osmo_strbuf, sb->pos == NULL, which is defined as semantically identical to pointing at the
* start of the buffer. A caller may just write to the buffer and call osmo_strbuf_added_tail(), in which case
* still pos == NULL. pos != NULL happens as soon as the first OSMO_STRBUF_*() API has acted on the strbuf. */
if (!sb->pos)
sb->pos = sb->buf;
sb->chars_needed += n_chars;
/* first get remaining space, not counting trailing nul; but safeguard against empty buffer */
size_t n_added = OSMO_STRBUF_REMAIN(*sb);
if (n_added)
n_added--;
/* do not add more than fit in sb->len, still ensuring nul termination */
n_added = OSMO_MIN(n_added, n_chars);
if (n_added)
sb->pos += n_added;
/* when a strbuf is full, sb->pos may point after the final nul, so nul terminate only when pos is valid. */
if (sb->pos < sb->buf + sb->len)
*sb->pos = '\0';
}
/*! Compare start of a string.
* This is an optimisation of 'strstr(str, startswith_str) == str' because it doesn't search through the entire string.
* \param str (Longer) string to compare.
* \param startswith_str (Shorter) string to compare with the start of str.
* \return true iff the first characters of str fully match startswith_str or startswith_str is empty. */
bool osmo_str_startswith(const char *str, const char *startswith_str)
{
if (!startswith_str || !*startswith_str)
return true;
if (!str)
return false;
return strncmp(str, startswith_str, strlen(startswith_str)) == 0;
}
/*! Convert a string of a floating point number to a signed int, with a decimal factor (fixed-point precision).
* For example, with precision=3, convert "-1.23" to -1230. In other words, the float value is multiplied by
* 10 to-the-power-of precision to obtain the returned integer.
* The usable range of digits is -INT64_MAX .. INT64_MAX -- note, not INT64_MIN! The value of INT64_MIN is excluded to
* reduce implementation complexity. See also utils_test.c.
* The advantage over using sscanf("%f") is guaranteed precision: float or double types may apply rounding in the
* conversion result. osmo_float_str_to_int() and osmo_int_to_float_str_buf() guarantee true results when converting
* back and forth between string and int.
* \param[out] val Returned integer value.
* \param[in] str String of a float, like '-12.345'.
* \param[in] precision Fixed-point precision, or * \returns 0 on success, negative on error.
*/
int osmo_float_str_to_int(int64_t *val, const char *str, unsigned int precision)
{
const char *point;
char *endptr;
const char *p;
int64_t sign = 1;
int64_t integer = 0;
int64_t decimal = 0;
int64_t precision_factor;
int64_t integer_max;
int64_t decimal_max;
unsigned int i;
OSMO_ASSERT(val);
*val = 0;
if (!str)
return -EINVAL;
if (str[0] == '-') {
str = str + 1;
sign = -1;
} else if (str[0] == '+') {
str = str + 1;
}
if (!str[0])
return -EINVAL;
/* Validate entire string as purely digits and at most one decimal dot. If not doing this here in advance,
* parsing digits might stop early because of precision cut-off and miss validation of input data. */
point = NULL;
for (p = str; *p; p++) {
if (*p == '.') {
if (point)
return -EINVAL;
point = p;
} else if (!isdigit((unsigned char)*p))
return -EINVAL;
}
/* Parse integer part if there is one. If the string starts with a point, there's nothing to parse for the
* integer part. */
if (!point || point > str) {
errno = 0;
integer = strtoll(str, &endptr, 10);
if ((errno == ERANGE && (integer == LLONG_MAX || integer == LLONG_MIN))
|| (errno != 0 && integer == 0))
return -ERANGE;
if ((point && endptr != point)
|| (!point && *endptr))
return -EINVAL;
}
/* Parse the fractional part if there is any, and if the precision is nonzero (if we even care about fractional
* digits) */
if (precision && point && point[1] != '\0') {
/* limit the number of digits parsed to 'precision'.
* If 'precision' is larger than the 19 digits representable in int64_t, skip some, to pick up lower
* magnitude digits. */
unsigned int skip_digits = (precision < 20) ? 0 : precision - 20;
char decimal_str[precision + 1];
osmo_strlcpy(decimal_str, point+1, precision+1);
/* fill with zeros to make exactly 'precision' digits */
for (i = strlen(decimal_str); i < precision; i++)
decimal_str[i] = '0';
decimal_str[precision] = '\0';
for (i = 0; i < skip_digits; i++) {
/* When skipping digits because precision > nr-of-digits-in-int64_t, they must be zero;
* if there is a nonzero digit above the precision, it's -ERANGE. */
if (decimal_str[i] != '0')
return -ERANGE;
}
errno = 0;
decimal = strtoll(decimal_str + skip_digits, &endptr, 10);
if ((errno == ERANGE && (decimal == LLONG_MAX || decimal == LLONG_MIN))
|| (errno != 0 && decimal == 0))
return -ERANGE;
if (*endptr)
return -EINVAL;
}
if (precision > 18) {
/* Special case of returning more digits than fit in int64_t range, e.g.
* osmo_float_str_to_int("0.0000000012345678901234567", precision=25) -> 12345678901234567. */
precision_factor = 0;
integer_max = 0;
decimal_max = INT64_MAX;
} else {
/* Do not surpass the resulting int64_t range. Depending on the amount of precision, the integer part
* and decimal part have specific ranges they must comply to. */
precision_factor = 1;
for (i = 0; i < precision; i++)
precision_factor *= 10;
integer_max = INT64_MAX / precision_factor;
if (integer == integer_max)
decimal_max = INT64_MAX % precision_factor;
else
decimal_max = INT64_MAX;
}
if (integer > integer_max)
return -ERANGE;
if (decimal > decimal_max)
return -ERANGE;
*val = sign * (integer * precision_factor + decimal);
return 0;
}
/*! Convert an integer to a floating point string using a decimal quotient (fixed-point precision).
* For example, with precision = 3, convert -1230 to "-1.23".
* The usable range of digits is -INT64_MAX .. INT64_MAX -- note, not INT64_MIN! The value of INT64_MIN is excluded to
* reduce implementation complexity. See also utils_test.c.
* The advantage over using printf("%.6g") is guaranteed precision: float or double types may apply rounding in the
* conversion result. osmo_float_str_to_int() and osmo_int_to_float_str_buf() guarantee true results when converting
* back and forth between string and int.
* The resulting string omits trailing zeros in the fractional part (like "%g" would) but never applies rounding.
* \param[out] buf Buffer to write string to.
* \param[in] buflen sizeof(buf).
* \param[in] val Value to convert to float.
* \returns number of chars that would be written, like snprintf().
*/
int osmo_int_to_float_str_buf(char *buf, size_t buflen, int64_t val, unsigned int precision)
{
struct osmo_strbuf sb = { .buf = buf, .len = buflen };
unsigned int i;
unsigned int w;
int64_t precision_factor;
if (val < 0) {
OSMO_STRBUF_PRINTF(sb, "-");
if (val == INT64_MIN) {
OSMO_STRBUF_PRINTF(sb, "ERR");
return sb.chars_needed;
}
val = -val;
}
if (precision > 18) {
/* Special case of returning more digits than fit in int64_t range, e.g.
* osmo_int_to_float_str(12345678901234567, precision=25) -> "0.0000000012345678901234567". */
if (!val) {
OSMO_STRBUF_PRINTF(sb, "0");
return sb.chars_needed;
}
OSMO_STRBUF_PRINTF(sb, "0.");
for (i = 19; i < precision; i++)
OSMO_STRBUF_PRINTF(sb, "0");
precision = 19;
} else {
precision_factor = 1;
for (i = 0; i < precision; i++)
precision_factor *= 10;
OSMO_STRBUF_PRINTF(sb, "%" PRId64, val / precision_factor);
val %= precision_factor;
if (!val)
return sb.chars_needed;
OSMO_STRBUF_PRINTF(sb, ".");
}
/* print fractional part, skip trailing zeros */
w = precision;
while (!(val % 10)) {
val /= 10;
w--;
}
OSMO_STRBUF_PRINTF(sb, "%0*" PRId64, w, val);
return sb.chars_needed;
}
/*! Convert an integer with a factor of a million to a floating point string.
* For example, convert -1230000 to "-1.23".
* \param[in] ctx Talloc ctx to allocate string buffer from.
* \param[in] val Value to convert to float.
* \returns resulting string, dynamically allocated.
*/
char *osmo_int_to_float_str_c(void *ctx, int64_t val, unsigned int precision)
{
OSMO_NAME_C_IMPL(ctx, 16, "ERROR", osmo_int_to_float_str_buf, val, precision)
}
/*! Convert a string of a number to int64_t, including all common strtoll() validity checks.
* It's not so trivial to call strtoll() and properly verify that the input string was indeed a valid number string.
* \param[out] result Buffer for the resulting integer number, or NULL if the caller is only interested in the
* validation result (returned rc).
* \param[in] str The string to convert.
* \param[in] base The integer base, i.e. 10 for decimal numbers or 16 for hexadecimal, as in strtoll().
* \param[in] min_val The smallest valid number expected in the string.
* \param[in] max_val The largest valid number expected in the string.
* \return 0 on success, -EOVERFLOW if the number in the string exceeds int64_t, -ENOTSUPP if the base is not supported,
* -ERANGE if the converted number exceeds the range [min_val..max_val] but is still within int64_t range, -E2BIG if
* surplus characters follow after the number, -EINVAL if the string does not contain a number. In case of -ERANGE and
* -E2BIG, the converted number is still accurately returned in result. In case of -EOVERFLOW, the returned value is
* clamped to INT64_MIN..INT64_MAX.
*/
int osmo_str_to_int64(int64_t *result, const char *str, int base, int64_t min_val, int64_t max_val)
{
long long int val;
char *endptr;
if (result)
*result = 0;
if (!str || !*str)
return -EINVAL;
errno = 0;
val = strtoll(str, &endptr, base);
/* In case the number string exceeds long long int range, strtoll() clamps the returned value to LLONG_MIN or
* LLONG_MAX. Make sure of the same here with respect to int64_t. */
if (val < INT64_MIN) {
if (result)
*result = INT64_MIN;
return -ERANGE;
}
if (val > INT64_MAX) {
if (result)
*result = INT64_MAX;
return -ERANGE;
}
if (result)
*result = (int64_t)val;
switch (errno) {
case 0:
break;
case ERANGE:
return -EOVERFLOW;
default:
case EINVAL:
return -ENOTSUP;
}
if (!endptr || *endptr) {
/* No chars were converted */
if (endptr == str)
return -EINVAL;
/* Or there are surplus chars after the converted number */
return -E2BIG;
}
if (val < min_val || val > max_val)
return -ERANGE;
return 0;
}
/*! Convert a string of a number to int, including all common strtoll() validity checks.
* Same as osmo_str_to_int64() but using the plain int data type.
* \param[out] result Buffer for the resulting integer number, or NULL if the caller is only interested in the
* validation result (returned rc).
* \param[in] str The string to convert.
* \param[in] base The integer base, i.e. 10 for decimal numbers or 16 for hexadecimal, as in strtoll().
* \param[in] min_val The smallest valid number expected in the string.
* \param[in] max_val The largest valid number expected in the string.
* \return 0 on success, -EOVERFLOW if the number in the string exceeds int range, -ENOTSUPP if the base is not supported,
* -ERANGE if the converted number exceeds the range [min_val..max_val] but is still within int range, -E2BIG if
* surplus characters follow after the number, -EINVAL if the string does not contain a number. In case of -ERANGE and
* -E2BIG, the converted number is still accurately returned in result. In case of -EOVERFLOW, the returned value is
* clamped to INT_MIN..INT_MAX.
*/
int osmo_str_to_int(int *result, const char *str, int base, int min_val, int max_val)
{
int64_t val;
int rc = osmo_str_to_int64(&val, str, base, min_val, max_val);
/* In case the number string exceeds long long int range, strtoll() clamps the returned value to LLONG_MIN or
* LLONG_MAX. Make sure of the same here with respect to int. */
if (val < INT_MIN) {
if (result)
*result = INT_MIN;
return -EOVERFLOW;
}
if (val > INT_MAX) {
if (result)
*result = INT_MAX;
return -EOVERFLOW;
}
if (result)
*result = (int)val;
return rc;
}
/*! Replace a string using talloc and release its prior content (if any).
* This is a format string capable equivalent of osmo_talloc_replace_string().
* \param[in] ctx Talloc context to use for allocation.
* \param[out] dst Pointer to string, will be updated with ptr to new string.
* \param[in] fmt Format string that will be copied to newly allocated string. */
void osmo_talloc_replace_string_fmt(void *ctx, char **dst, const char *fmt, ...)
{
char *name = NULL;
if (fmt != NULL) {
va_list ap;
va_start(ap, fmt);
name = talloc_vasprintf(ctx, fmt, ap);
va_end(ap);
}
talloc_free(*dst);
*dst = name;
}
/*! @} */
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