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buf: add buf_add_fmt()

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Johan Malm 2024-08-19 21:22:50 +01:00 • committed by Consolatis
parent cd961b1ac1
commit 6564e1bc8d
3 changed files with 56 additions and 0 deletions
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34
src/common/buf.c
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@ -1,7 +1,9 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <assert.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include "common/buf.h"
#include "common/macros.h"
@ -95,6 +97,38 @@ buf_expand(struct buf *s, int new_alloc)
s->alloc = new_alloc;
}
void
buf_add_fmt(struct buf *s, const char *fmt, ...)
{
if (string_null_or_empty(fmt)) {
return;
}
size_t size = 0;
va_list ap;
va_start(ap, fmt);
int n = vsnprintf(NULL, size, fmt, ap);
va_end(ap);
if (n < 0) {
return;
}
size = (size_t)n + 1;
buf_expand(s, s->len + size);
va_start(ap, fmt);
n = vsnprintf(s->data + s->len, size, fmt, ap);
va_end(ap);
if (n < 0) {
return;
}
s->len += n;
s->data[s->len] = 0;
}
void
buf_add(struct buf *s, const char *data)
{