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vsprintf: split out '%s' handling logic 

The actual code is the same, just split out into a helper function.
This makes it easier to read, and allows for future sharing of the
string code.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2008-07-06 16:06:25 -07:00
parent 1b40a895df
commit 0f9bfa569d
1 changed files with 31 additions and 26 deletions
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57
lib/vsprintf.c
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@ -482,6 +482,35 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
return buf;
}
static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags)
{
int len, i;
if ((unsigned long)s < PAGE_SIZE)
s = "<NULL>";
len = strnlen(s, precision);
if (!(flags & LEFT)) {
while (len < field_width--) {
if (buf < end)
*buf = ' ';
++buf;
}
}
for (i = 0; i < len; ++i) {
if (buf < end)
*buf = *s;
++buf; ++s;
}
while (len < field_width--) {
if (buf < end)
*buf = ' ';
++buf;
}
return buf;
}
/**
* vsnprintf - Format a string and place it in a buffer
* @buf: The buffer to place the result into
@ -502,11 +531,9 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
*/
int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
int len;
unsigned long long num;
int i, base;
int base;
char *str, *end, c;
const char *s;
int flags; /* flags to number() */
@ -622,29 +649,7 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
continue;
case 's':
s = va_arg(args, char *);
if ((unsigned long)s < PAGE_SIZE)
s = "<NULL>";
len = strnlen(s, precision);
if (!(flags & LEFT)) {
while (len < field_width--) {
if (str < end)
*str = ' ';
++str;
}
}
for (i = 0; i < len; ++i) {
if (str < end)
*str = *s;
++str; ++s;
}
while (len < field_width--) {
if (str < end)
*str = ' ';
++str;
}
str = string(str, end, va_arg(args, char *), field_width, precision, flags);
continue;
case 'p':