specifier.c revision f33d3ec1d7521c91da8b30ad5cb345d6416bb07d
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <string.h>
#include "macro.h"
#include "util.h"
#include "specifier.h"
/*
* Generic infrastructure for replacing %x style specifiers in
* strings. Will call a callback for each replacement.
*
*/
char *specifier_printf(const char *text, const Specifier table[], void *userdata) {
char *r, *t;
const char *f;
bool percent = false;
size_t l;
assert(text);
assert(table);
l = strlen(text);
if (!(r = new(char, l+1)))
return NULL;
t = r;
for (f = text; *f; f++, l--) {
if (percent) {
if (*f == '%')
*(t++) = '%';
else {
const Specifier *i;
for (i = table; i->specifier; i++)
if (i->specifier == *f)
break;
if (i->lookup) {
char *n, *w;
size_t k, j;
if (!(w = i->lookup(i->specifier, i->data, userdata))) {
free(r);
return NULL;
}
j = t - r;
k = strlen(w);
if (!(n = new(char, j + k + l + 1))) {
free(r);
free(w);
return NULL;
}
memcpy(n, r, j);
memcpy(n + j, w, k);
free(r);
free(w);
r = n;
t = n + j + k;
} else {
*(t++) = '%';
*(t++) = *f;
}
}
percent = false;
} else if (*f == '%')
percent = true;
else
*(t++) = *f;
}
*t = 0;
return r;
}
/* Generic handler for simple string replacements */
char* specifier_string(char specifier, void *data, void *userdata) {
return strdup(strempty(data));
}