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Add strbuf_va_vprintf() convenience macro

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This commit is contained in:
Andrew Bettison 2013-09-19 16:34:02 +09:30
parent 5c84b2ffd5
commit a4704dfd3c
1 changed files with 23 additions and 4 deletions
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27
strbuf.h
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@ -132,7 +132,7 @@ typedef const struct strbuf *const_strbuf;
/** Convenience macro for filling a strbuf from the calling function's
* printf(3)-like variadic arguments. See alloca(3) for more information.
* printf(3)-like variadic arguments.
*
* #include <stdarg.h>
*
@ -147,7 +147,27 @@ typedef const struct strbuf *const_strbuf;
#define strbuf_va_printf(sb,fmt) do { \
va_list __strbuf_ap; \
va_start(__strbuf_ap, fmt); \
strbuf_vsprintf(sb, fmt, __strbuf_ap); \
strbuf_vsprintf(sb, (fmt), __strbuf_ap); \
va_end(__strbuf_ap); \
} while (0)
/** Convenience macro for filling a strbuf from the calling function's va_list
* variadic argument pointer.
*
* #include <stdarg.h>
*
* void funcf(const char *format, va_list ap) {
* strbuf b = strbuf_alloca(1024);
* strbuf_va_vprintf(b, format, ap);
* ...
* }
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
#define strbuf_va_vprintf(sb,fmt,ap) do { \
va_list __strbuf_ap; \
va_copy(__strbuf_ap, (ap)); \
strbuf_vsprintf(sb, (fmt), __strbuf_ap); \
va_end(__strbuf_ap); \
} while (0)
@ -314,8 +334,7 @@ strbuf strbuf_putc(strbuf sb, char ch);
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
int strbuf_sprintf(strbuf sb, const char *fmt, ...)
__attribute__ (( format(printf,2,3) ));
int strbuf_sprintf(strbuf sb, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
int strbuf_vsprintf(strbuf sb, const char *fmt, va_list ap);