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-rw-r--r--src/specifier.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/src/specifier.c b/src/specifier.c
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+++ b/src/specifier.c
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+/*-*- 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 General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU 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));
+}