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spa: utils: string: add spa_strbuf_appendv()

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Add a function that makes it possible to pass a `va_list` when
printing into a `spa_strbuf`.
This commit is contained in:
Barnabás Pőcze 2026-03-12 00:17:18 +01:00 • committed by Wim Taymans
parent e4e5f62d44
commit 00148467ef
1 changed files with 14 additions and 5 deletions
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19
spa/include/spa/utils/string.h
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@ -380,17 +380,26 @@ SPA_API_STRING void spa_strbuf_init(struct spa_strbuf *buf, char *buffer, size_t
buf->buffer[0] = '\0'; buf->buffer[0] = '\0';
} }
SPA_PRINTF_FUNC(2, 0)
SPA_API_STRING int spa_strbuf_appendv(struct spa_strbuf *buf, const char *fmt, va_list args)
{
size_t remain = buf->maxsize - buf->pos;
int written = vsnprintf(&buf->buffer[buf->pos], remain, fmt, args);
if (written > 0)
buf->pos += SPA_MIN(remain, (size_t)written);
return written;
}
SPA_PRINTF_FUNC(2, 3) SPA_PRINTF_FUNC(2, 3)
SPA_API_STRING int spa_strbuf_append(struct spa_strbuf *buf, const char *fmt, ...) SPA_API_STRING int spa_strbuf_append(struct spa_strbuf *buf, const char *fmt, ...)
{ {
size_t remain = buf->maxsize - buf->pos;
ssize_t written;
va_list args; va_list args;
int written;
va_start(args, fmt); va_start(args, fmt);
written = vsnprintf(&buf->buffer[buf->pos], remain, fmt, args); written = spa_strbuf_appendv(buf, fmt, args);
va_end(args); va_end(args);
if (written > 0)
buf->pos += SPA_MIN(remain, (size_t)written);
return written; return written;
} }