libsa: add asprintf()
asprintf() is a nice tool for string processing. MFC after: 2 weeks
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e9b9f14056
@ -121,6 +121,34 @@ snprint_func(int ch, void *arg)
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pbuf->size--;
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}
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int
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asprintf(char **buf, const char *cfmt, ...)
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{
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int retval;
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struct print_buf arg;
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va_list ap;
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*buf = NULL;
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va_start(ap, cfmt);
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retval = kvprintf(cfmt, NULL, NULL, 10, ap);
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va_end(ap);
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if (retval <= 0)
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return (-1);
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arg.size = retval + 1;
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arg.buf = *buf = malloc(arg.size);
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if (*buf == NULL)
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return (-1);
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va_start(ap, cfmt);
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retval = kvprintf(cfmt, &snprint_func, &arg, 10, ap);
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va_end(ap);
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if (arg.size >= 1)
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*(arg.buf)++ = 0;
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return (retval);
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}
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int
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snprintf(char *buf, size_t size, const char *cfmt, ...)
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{
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@ -268,6 +268,7 @@ extern void *reallocf(void *ptr, size_t size);
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extern void mallocstats(void);
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extern int printf(const char *fmt, ...) __printflike(1, 2);
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extern int asprintf(char **buf, const char *cfmt, ...) __printflike(2, 3);
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extern int sprintf(char *buf, const char *cfmt, ...) __printflike(2, 3);
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extern int snprintf(char *buf, size_t size, const char *cfmt, ...) __printflike(3, 4);
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extern int vprintf(const char *fmt, __va_list);
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