mirror of
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146 lines
2.5 KiB
C
146 lines
2.5 KiB
C
/*
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* fmt-pango.c - Format strings for Pango markup
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*
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* Written 2016 by Werner Almesberger
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* Copyright 2016 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#define _GNU_SOURCE /* for asprintf */
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <alloca.h>
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#include "util.h"
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#include "diag.h"
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#include "fmt-pango.h"
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unsigned vsfmt_pango(char *buf, const char *fmt, va_list ap)
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{
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char *res;
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const char *p, *q, *s, *t;
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char *u;
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char *tmp_fmt;
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char *tmp, *tmp2;
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int len;
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unsigned extra;
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res = buf;
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for (p = fmt; *p; p++) {
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if (*p != '%') {
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if (buf)
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*res = *p;
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res++;
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continue;
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}
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for (q = p + 1; isdigit(*q) || *q == '.' || *q == '-'; q++);
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tmp_fmt = alloca(q - p + 1 + 1);
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memcpy(tmp_fmt, p, q - p + 1);
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tmp_fmt[q - p + 1] = 0;
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switch (*q) {
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case 's':
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s = va_arg(ap, const char *);
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len = asprintf(&tmp, tmp_fmt, s);
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extra = 0;
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for (t = tmp; *t; t++)
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switch (*t) {
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case '<':
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case '>':
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extra += 3;
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break;
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case '&':
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extra += 4;
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break;
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default:
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break;
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}
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if (extra) {
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tmp2 = u = alloca(len + extra + 1);
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for (t = tmp; *t; t++) {
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switch (*t) {
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case '<':
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strcpy(u, "<");
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u += 4;
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break;
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case '>':
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strcpy(u, ">");
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u += 4;
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break;
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case '&':
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strcpy(u, "&");
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u += 5;
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break;
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default:
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*u++ = *t;
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break;
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}
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}
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*u = 0;
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tmp = tmp2;
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}
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if (buf)
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memcpy(res, tmp, len + extra);
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res += len + extra;
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break;
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case 'c':
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/* @@@ we don't filter markup meta-characters */
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case 'd':
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case 'x':
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len = asprintf(&tmp, tmp_fmt, va_arg(ap, int));
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if (buf)
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memcpy(res, tmp, len);
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res += len;
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break;
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case '%':
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if (buf)
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*res = '%';
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res++;
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break;
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default:
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fatal("unrecognized format '%%%c'\n", *q);
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}
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p = q;
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}
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if (buf)
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*res = 0;
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return res - buf;
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}
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char *vfmt_pango(const char *fmt, va_list ap)
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{
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va_list aq;
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unsigned len;
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char *buf;
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va_copy(aq, ap);
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len = vsfmt_pango(NULL, fmt, ap);
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buf = alloc_size(len + 1);
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vsfmt_pango(buf, fmt, aq);
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va_end(aq);
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return buf;
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}
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char *fmt_pango(const char *fmt, ...)
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{
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va_list ap;
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char *buf;
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va_start(ap, fmt);
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buf = vfmt_pango(fmt, ap);
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va_end(ap);
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return buf;
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}
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