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