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98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/*
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Serval extensible printf.
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Copyright (C) 2012 Serval Project Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "strbuf.h"
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#include "xprintf.h"
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void xprintf(XPRINTF xfp, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vxprintf(xfp, fmt, ap);
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va_end(ap);
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}
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void vxprintf(XPRINTF xfp, const char *fmt, va_list ap)
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{
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(*xfp.func)(xfp.context, fmt, ap);
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}
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void xputs(const char *str, XPRINTF xpf)
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{
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xprintf(xpf, "%s", str);
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}
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void xputc(char c, XPRINTF xpf)
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{
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xprintf(xpf, "%c", c);
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}
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void _cx_vprintf_stdio(void *context, const char *fmt, va_list ap)
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{
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vfprintf((FILE *)context, fmt, ap);
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}
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static void grow_mallocbuf(struct mallocbuf *mb, size_t extra)
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{
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size_t newsize = mb->size + extra;
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// Round up to nearest multiple of 1024.
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newsize = newsize + 1024 - ((newsize - 1) % 1024 + 1);
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char *newbuf = realloc(mb->buffer, newsize);
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if (newbuf) {
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mb->current += newbuf - mb->buffer;
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mb->size = newsize;
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mb->buffer = newbuf;
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}
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}
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void _cx_vprintf_mallocbuf(void *context, const char *fmt, va_list ap)
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{
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struct mallocbuf *mb = (struct mallocbuf *) context;
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if (mb->buffer == NULL)
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grow_mallocbuf(mb, 1024);
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if (mb->current) {
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if (mb->current + 1 >= mb->buffer + mb->size)
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grow_mallocbuf(mb, 1024);
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int n = vsnprintf(mb->current, mb->buffer + mb->size - mb->current, fmt, ap);
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char *newcurrent = mb->current + n;
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char *end = mb->buffer + mb->size;
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if (newcurrent < end)
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mb->current = newcurrent;
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else {
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grow_mallocbuf(mb, newcurrent - end + 1);
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n = vsnprintf(mb->current, mb->buffer + mb->size - mb->current, fmt, ap);
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char *newcurrent = mb->current + n;
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char *end = mb->buffer + mb->size;
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if (newcurrent < end)
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mb->current = newcurrent;
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else {
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mb->current = mb->buffer + mb->size - 1;
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*mb->current = '\0';
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}
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}
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}
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}
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void _cx_vprintf_strbuf(void *context, const char *fmt, va_list ap)
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{
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strbuf_vsprintf((strbuf)context, fmt, ap);
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}
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