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util: introduce xstrndup helper

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We already have xstrdup, add xstrndup as well to make it
straight-forward to clone part of a string.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
This commit is contained in:
Ahmad Fatoum 2020-10-25 10:41:18 +01:00 committed by David Gibson
parent 4048aed12b
commit 651410e54c
2 changed files with 12 additions and 0 deletions
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11
util.c
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@ -33,6 +33,17 @@ char *xstrdup(const char *s)
return d; return d;
} }
char *xstrndup(const char *s, size_t n)
{
size_t len = strnlen(s, n) + 1;
char *d = xmalloc(len);
memcpy(d, s, len - 1);
d[len - 1] = '\0';
return d;
}
int xavsprintf_append(char **strp, const char *fmt, va_list ap) int xavsprintf_append(char **strp, const char *fmt, va_list ap)
{ {
int n, size = 0; /* start with 128 bytes */ int n, size = 0; /* start with 128 bytes */

1
util.h
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@ -61,6 +61,7 @@ static inline void *xrealloc(void *p, size_t len)
} }
extern char *xstrdup(const char *s); extern char *xstrdup(const char *s);
extern char *xstrndup(const char *s, size_t len);
extern int PRINTF(2, 3) xasprintf(char **strp, const char *fmt, ...); extern int PRINTF(2, 3) xasprintf(char **strp, const char *fmt, ...);
extern int PRINTF(2, 3) xasprintf_append(char **strp, const char *fmt, ...); extern int PRINTF(2, 3) xasprintf_append(char **strp, const char *fmt, ...);