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authorLennart Poettering <lennart@poettering.net>2012-11-14 22:20:17 +0100
committerLennart Poettering <lennart@poettering.net>2012-11-14 22:21:16 +0100
commit6e6fb527f987d0c1f5bd930020301c9ac76a5e2c (patch)
treee09883a08ec68bf8e89b875566b6f24857116d3c /src
parent409bc9c33e99d5bb1e04d01bf3c75854d3a5dc7e (diff)
shared: add API for replacing @FOO@ style variables in strings
Diffstat (limited to 'src')
-rw-r--r--src/shared/replace-var.c110
-rw-r--r--src/shared/replace-var.h24
-rw-r--r--src/test/test-replace-var.c46
3 files changed, 180 insertions, 0 deletions
diff --git a/src/shared/replace-var.c b/src/shared/replace-var.c
new file mode 100644
index 0000000000..e11c57a43d
--- /dev/null
+++ b/src/shared/replace-var.c
@@ -0,0 +1,110 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 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 "replace-var.h"
+
+/*
+ * Generic infrastructure for replacing @FOO@ style variables in
+ * strings. Will call a callback for each replacement.
+ */
+
+static int get_variable(const char *b, char **r) {
+ size_t k;
+ char *t;
+
+ assert(b);
+ assert(r);
+
+ if (*b != '@')
+ return 0;
+
+ k = strspn(b + 1, "ABCDEFGHIJKLMNOPQRSTUVWXYZ_");
+ if (k <= 0 || b[k+1] != '@')
+ return 0;
+
+ t = strndup(b + 1, k);
+ if (!t)
+ return -ENOMEM;
+
+ *r = t;
+ return 1;
+}
+
+char *replace_var(const char *text, char *(*lookup)(const char *variable, void*userdata), void *userdata) {
+ char *r, *t;
+ const char *f;
+ size_t l;
+
+ assert(text);
+ assert(lookup);
+
+ l = strlen(text);
+ r = new(char, l+1);
+ if (!r)
+ return NULL;
+
+ f = text;
+ t = r;
+ while (*f) {
+ _cleanup_free_ char *v = NULL, *n = NULL;
+ char *a;
+ int k;
+ size_t skip, d, nl;
+
+ k = get_variable(f, &v);
+ if (k < 0)
+ goto oom;
+ if (k == 0) {
+ *(t++) = *(f++);
+ continue;
+ }
+
+ n = lookup(v, userdata);
+ if (!n)
+ goto oom;
+
+ skip = strlen(v) + 2;
+
+ d = t - r;
+ nl = l - skip + strlen(n);
+ a = realloc(r, nl + 1);
+ if (!a)
+ goto oom;
+
+ l = nl;
+ r = a;
+ t = r + d;
+
+ t = stpcpy(t, n);
+ f += skip;
+ }
+
+ *t = 0;
+ return r;
+
+oom:
+ free(r);
+ return NULL;
+}
diff --git a/src/shared/replace-var.h b/src/shared/replace-var.h
new file mode 100644
index 0000000000..7eaee93a3e
--- /dev/null
+++ b/src/shared/replace-var.h
@@ -0,0 +1,24 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 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/>.
+***/
+
+char *replace_var(const char *text, char *(*lookup)(const char *variable, void*userdata), void *userdata);
diff --git a/src/test/test-replace-var.c b/src/test/test-replace-var.c
new file mode 100644
index 0000000000..b1d42d77fd
--- /dev/null
+++ b/src/test/test-replace-var.c
@@ -0,0 +1,46 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 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 "util.h"
+#include "macro.h"
+#include "replace-var.h"
+
+static char *lookup(const char *variable, void *userdata) {
+ return strjoin("<<<", variable, ">>>", NULL);
+}
+
+int main(int argc, char *argv[]) {
+ char *r;
+
+ assert_se(r = replace_var("@@@foobar@xyz@HALLO@foobar@test@@testtest@TEST@...@@@", lookup, NULL));
+ puts(r);
+ assert_se(streq(r, "@@@foobar@xyz<<<HALLO>>>foobar@test@@testtest<<<TEST>>>...@@@"));
+ free(r);
+
+ assert_se(r = strreplace("XYZFFFFXYZFFFFXYZ", "XYZ", "ABC"));
+ puts(r);
+ assert_se(streq(r, "ABCFFFFABCFFFFABC"));
+ free(r);
+
+ return 0;
+}