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#include "strbuf.h"
#include "util.h"
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
void
strbuf_init(struct strbuf *strbuf)
{
strbuf->buf = NULL;
strbuf->cap = 0;
}
void
strbuf_deinit(struct strbuf *strbuf)
{
free(strbuf->buf);
}
void
strbuf_clear(struct strbuf *strbuf)
{
if (!strbuf->buf)
strbuf_append(strbuf, "");
strbuf->buf[0] = '\0';
}
void
strbuf_append(struct strbuf *strbuf, const char *fmt, ...)
{
va_list ap, cpy;
ssize_t slen;
int blen;
va_copy(cpy, ap);
blen = strbuf->buf ? strlen(strbuf->buf) : 0;
va_start(cpy, fmt);
slen = vsnprintf(NULL, 0, fmt, cpy);
if (slen < 0) ERROR(SYSTEM, "snprintf");
va_end(cpy);
if (blen + slen + 1 > strbuf->cap) {
strbuf->cap = blen + slen + 1;
strbuf->buf = realloc(strbuf->buf, strbuf->cap);
if (!strbuf->buf) ERROR(SYSTEM, "realloc");
}
va_start(ap, fmt);
vsnprintf(strbuf->buf + blen, slen + 1, fmt, ap);
va_end(ap);
}
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