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#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <bufprintf.h>
int vbufprintf(struct print_buf *buf, const char *format, va_list ap)
{
va_list ap2;
int rv;
va_copy(ap2, ap);
rv = vsnprintf(NULL, 0, format, ap);
/* >= to make sure we have space for terminating null */
if (rv + buf->len >= buf->size) {
size_t newsize = rv + buf->len + BUFPAD;
char *newbuf;
newbuf = realloc(buf->buf, newsize);
if (!newbuf) {
rv = -1;
goto bail;
}
buf->buf = newbuf;
buf->size = newsize;
}
rv = vsnprintf(buf->buf + buf->len, buf->size - buf->len, format, ap2);
buf->len += rv;
bail:
va_end(ap2);
return rv;
}
int bufprintf(struct print_buf *buf, const char *format, ...)
{
va_list ap;
int rv;
va_start(ap, format);
rv = vbufprintf(buf, format, ap);
va_end(ap);
return rv;
}
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