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add a_strcat function to util

This commit is contained in:
Julien Danjou 2007-09-24 16:53:03 +02:00
parent 9a97c13804
commit b5f2129680
1 changed files with 40 additions and 0 deletions
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40
util.h
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@ -109,6 +109,30 @@ static inline ssize_t a_strlen(const char *s)
return s ? strlen(s) : 0;
}
/** \brief \c NULL resistant strnlen.
*
* Unlinke it's GNU libc sibling, a_strnlen returns a ssize_t, and supports
* its argument beeing NULL.
*
* The a_strnlen() function returns the number of characters in the string
* pointed to by \c s, not including the terminating \c \\0 character, but at
* most \c n. In doing this, a_strnlen() looks only at the first \c n
* characters at \c s and never beyond \c s+n.
*
* \param[in] s the string.
* \param[in] n the maximum length to return.
* \return \c a_strlen(s) if less than \c n, else \c n.
*/
static inline ssize_t a_strnlen(const char *s, ssize_t n)
{
if (s)
{
const char *p = memchr(s, '\0', n);
return p ? p - s : n;
}
return 0;
}
/** \brief \c NULL resistant strdup.
*
* the a_strdup() function returns a pointer to a new string, which is a
@ -139,6 +163,22 @@ static inline int a_strcmp(const char *a, const char *b)
ssize_t a_strncpy(char *dst, ssize_t n, const char *src, ssize_t l) __attribute__((nonnull(1)));
ssize_t a_strcpy(char *dst, ssize_t n, const char *src) __attribute__((nonnull(1)));
/** \brief safe strcat.
*
* The a_strcat() function appends the string \c src at the end of the buffer
* \c dst if space is available.
*
* \param[in] dst destination buffer.
* \param[in] n size of the buffer, Negative sizes are allowed.
* \param[in] src the string to append.
* \return <tt>a_strlen(dst) + a_strlen(src)</tt>
*/
static inline ssize_t a_strcat(char *dst, ssize_t n, const char *src)
{
ssize_t dlen = a_strnlen(dst, n - 1);
return dlen + a_strcpy(dst + dlen, n - dlen, src);
}
void die(const char *, ...) __attribute__ ((noreturn)) __attribute__ ((format(printf, 1, 2)));
void eprint(const char *, ...) __attribute__ ((noreturn)) __attribute__ ((format(printf, 1, 2)));
Bool xgettextprop(Display *, Window, Atom, char *, unsigned int);