338 lines
7.5 KiB
C
338 lines
7.5 KiB
C
/* wmem_strutl.c
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* Wireshark Memory Manager String Utilities
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* Copyright 2012, Evan Huus <eapache@gmail.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <string.h>
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#include <stdarg.h>
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#ifdef _WIN32
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#include <stdio.h>
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#endif
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#include <glib.h>
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#include <glib/gprintf.h>
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#include "wmem_core.h"
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#include "wmem_allocator.h"
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#include "wmem_strutl.h"
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gchar *
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wmem_strdup(wmem_allocator_t *allocator, const gchar *src)
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{
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size_t len;
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/* If the string is NULL, just return the string "<NULL>" so that the
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* callers don't have to bother checking it. */
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if (!src) {
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src = "<NULL>";
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}
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len = strlen(src) + 1; /* +1 for the null-terminator */
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return (gchar *)memcpy(wmem_alloc(allocator, len), src, len);
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}
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gchar *
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wmem_strndup(wmem_allocator_t *allocator, const gchar *src, const size_t len)
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{
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gchar *dst;
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guint i;
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dst = (gchar *)wmem_alloc(allocator, len+1);
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for (i=0; (i < len) && src[i]; i++) {
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dst[i] = src[i];
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}
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dst[i] = '\0';
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return dst;
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}
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gchar *
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wmem_strdup_printf(wmem_allocator_t *allocator, const gchar *fmt, ...)
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{
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va_list ap;
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gchar *dst;
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va_start(ap, fmt);
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dst = wmem_strdup_vprintf(allocator, fmt, ap);
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va_end(ap);
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return dst;
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}
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/*
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* Using g_printf_string_upper_bound() to find the needed length almost doubles
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* the execution time of this function. Instead we use a pre allocated buffer
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* which may waste a bit of memory but are faster. As this is mostly called with
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* packet scoped memory(?) that shouldn't matter that much.
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* In my test file all strings was less than 72 characters long and quite a few
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* over 68 characters long. Chose 80 as the default.
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*/
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#ifndef _WIN32
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#define WMEM_STRDUP_VPRINTF_DEFAULT_BUFFER 80
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gchar *
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wmem_strdup_vprintf(wmem_allocator_t *allocator, const gchar *fmt, va_list ap)
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{
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va_list ap2;
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gchar *dst;
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int needed_len;
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G_VA_COPY(ap2, ap);
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/* needed_len = g_printf_string_upper_bound(fmt, ap2); */
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dst = (gchar *)wmem_alloc(allocator, WMEM_STRDUP_VPRINTF_DEFAULT_BUFFER);
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/* Returns: the number of characters which would be produced if the buffer was large enough
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* (not including the null, for which we add +1 ourselves). */
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needed_len = g_vsnprintf(dst, (gulong) WMEM_STRDUP_VPRINTF_DEFAULT_BUFFER, fmt, ap2) + 1;
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va_end(ap2);
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if (needed_len > WMEM_STRDUP_VPRINTF_DEFAULT_BUFFER) {
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wmem_free(allocator, dst);
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dst = (gchar *)wmem_alloc(allocator, needed_len);
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G_VA_COPY(ap2, ap);
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g_vsnprintf(dst, (gulong) needed_len, fmt, ap2);
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va_end(ap2);
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}
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return dst;
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}
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#else /* _WIN32 */
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/*
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* GLib's v*printf routines are surprisingly slow on Windows, at least with
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* GLib 2.40.0. This appears to be due to GLib using the gnulib version of
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* vasnprintf when compiled under MinGW. If GLib ever ends up using the
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* native Windows v*printf routines this can be removed.
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*/
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gchar *
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wmem_strdup_vprintf(wmem_allocator_t *allocator, const gchar *fmt, va_list ap)
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{
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va_list ap2;
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gchar *dst;
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int needed_len;
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G_VA_COPY(ap2, ap);
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needed_len = _vscprintf(fmt, ap2) + 1;
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dst = (gchar *)wmem_alloc(allocator, needed_len);
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vsprintf_s(dst, needed_len, fmt, ap2);
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va_end(ap2);
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return dst;
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}
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#endif /* _WIN32 */
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gchar *
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wmem_strconcat(wmem_allocator_t *allocator, const gchar *first, ...)
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{
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gsize len;
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va_list args;
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gchar *s;
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gchar *concat;
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gchar *ptr;
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if (!first)
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return NULL;
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len = 1 + strlen(first);
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va_start(args, first);
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while ((s = va_arg(args, gchar*))) {
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len += strlen(s);
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}
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va_end(args);
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ptr = concat = (gchar *)wmem_alloc(allocator, len);
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ptr = g_stpcpy(ptr, first);
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va_start(args, first);
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while ((s = va_arg(args, gchar*))) {
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ptr = g_stpcpy(ptr, s);
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}
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va_end(args);
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return concat;
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}
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gchar *
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wmem_strjoin(wmem_allocator_t *allocator,
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const gchar *separator, const gchar *first, ...)
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{
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gsize len;
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va_list args;
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gsize separator_len;
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gchar *s;
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gchar *concat;
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gchar *ptr;
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if (!first)
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return NULL;
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if (separator == NULL) {
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separator = "";
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}
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separator_len = strlen (separator);
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len = 1 + strlen(first); /* + 1 for null byte */
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va_start(args, first);
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while ((s = va_arg(args, gchar*))) {
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len += (separator_len + strlen(s));
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}
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va_end(args);
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ptr = concat = (gchar *)wmem_alloc(allocator, len);
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ptr = g_stpcpy(ptr, first);
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va_start(args, first);
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while ((s = va_arg(args, gchar*))) {
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ptr = g_stpcpy(ptr, separator);
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ptr = g_stpcpy(ptr, s);
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}
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va_end(args);
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return concat;
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}
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gchar *
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wmem_strjoinv(wmem_allocator_t *allocator,
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const gchar *separator, gchar **str_array)
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{
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gchar *string = NULL;
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if (!str_array)
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return NULL;
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if (separator == NULL) {
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separator = "";
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}
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if (str_array[0]) {
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gint i;
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gchar *ptr;
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gsize len, separator_len;
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separator_len = strlen(separator);
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/* Get first part of length. Plus one for null byte. */
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len = 1 + strlen(str_array[0]);
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/* Get the full length, including the separators. */
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for (i = 1; str_array[i] != NULL; i++) {
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len += separator_len;
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len += strlen(str_array[i]);
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}
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/* Allocate and build the string. */
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string = (gchar *)wmem_alloc(allocator, len);
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ptr = g_stpcpy(string, str_array[0]);
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for (i = 1; str_array[i] != NULL; i++) {
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ptr = g_stpcpy(ptr, separator);
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ptr = g_stpcpy(ptr, str_array[i]);
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}
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}
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return string;
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}
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gchar **
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wmem_strsplit(wmem_allocator_t *allocator, const gchar *src,
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const gchar *delimiter, int max_tokens)
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{
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gchar *splitted;
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gchar *s;
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guint tokens;
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guint sep_len;
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guint i;
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gchar **vec;
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if (!src || !delimiter || !delimiter[0])
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return NULL;
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/* An empty string results in an empty vector. */
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if (!src[0]) {
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vec = wmem_new0(allocator, gchar *);
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return vec;
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}
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splitted = wmem_strdup(allocator, src);
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sep_len = (guint)strlen(delimiter);
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if (max_tokens < 1)
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max_tokens = INT_MAX;
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/* Calculate the number of fields. */
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s = splitted;
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tokens = 1;
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while (tokens < (guint)max_tokens && (s = strstr(s, delimiter))) {
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s += sep_len;
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tokens++;
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}
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vec = wmem_alloc_array(allocator, gchar *, tokens + 1);
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/* Populate the array of string tokens. */
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s = splitted;
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vec[0] = s;
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tokens = 1;
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while (tokens < (guint)max_tokens && (s = strstr(s, delimiter))) {
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for (i = 0; i < sep_len; i++)
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s[i] = '\0';
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s += sep_len;
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vec[tokens] = s;
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tokens++;
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}
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vec[tokens] = NULL;
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return vec;
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}
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/*
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* wmem_ascii_strdown:
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* based on g_ascii_strdown.
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*/
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gchar*
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wmem_ascii_strdown(wmem_allocator_t *allocator, const gchar *str, gssize len)
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{
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gchar *result, *s;
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g_return_val_if_fail (str != NULL, NULL);
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if (len < 0)
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len = strlen (str);
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result = wmem_strndup(allocator, str, len);
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for (s = result; *s; s++)
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*s = g_ascii_tolower (*s);
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return result;
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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