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-rw-r--r--Makefile2
-rw-r--r--conf-parser.c321
-rw-r--r--conf-parser.h33
3 files changed, 355 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index f7ed5ebbcd..6f41e8878c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
CFLAGS=-Wall -Wextra -O0 -g -pipe -D_GNU_SOURCE -fdiagnostics-show-option -Wno-unused-parameter
LIBS=-lrt
-systemd: main.o name.o util.o set.o hashmap.o strv.o job.o manager.o
+systemd: main.o name.o util.o set.o hashmap.o strv.o job.o manager.o conf-parser.o
$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
clean:
diff --git a/conf-parser.c b/conf-parser.c
new file mode 100644
index 0000000000..c45acd7702
--- /dev/null
+++ b/conf-parser.c
@@ -0,0 +1,321 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <assert.h>
+#include <stdlib.h>
+
+#include "conf-parser.h"
+#include "util.h"
+#include "macro.h"
+
+#define WHITESPACE " \t\n"
+#define COMMENTS "#;\n"
+#define LINE_MAX 4096
+
+/* Run the user supplied parser for an assignment */
+static int next_assignment(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const ConfigItem *t,
+ const char *lvalue,
+ const char *rvalue,
+ void *userdata) {
+
+ assert(filename);
+ assert(t);
+ assert(lvalue);
+ assert(rvalue);
+
+ for (; t->parse; t++) {
+
+ if (t->lvalue && !streq(lvalue, t->lvalue))
+ continue;
+
+ if (t->section && !section)
+ continue;
+
+ if (t->section && !streq(section, t->section))
+ continue;
+
+ return t->parse(filename, line, section, lvalue, rvalue, t->data, userdata);
+ }
+
+ fprintf(stderr, "[%s:%u] Unknown lvalue '%s' in section '%s'.", filename, line, lvalue, strna(section));
+ return -EBADMSG;
+}
+
+/* Returns non-zero when c is contained in s */
+static int in_string(char c, const char *s) {
+ assert(s);
+
+ for (; *s; s++)
+ if (*s == c)
+ return 1;
+
+ return 0;
+}
+
+/* Remove all whitepsapce from the beginning and the end of *s. *s may
+ * be modified. */
+static char *strip(char *s) {
+ char *b = s+strspn(s, WHITESPACE);
+ char *e, *l = NULL;
+
+ for (e = b; *e; e++)
+ if (!in_string(*e, WHITESPACE))
+ l = e;
+
+ if (l)
+ *(l+1) = 0;
+
+ return b;
+}
+
+/* Parse a variable assignment line */
+static int parse_line(const char *filename, unsigned line, char **section, const ConfigItem *t, char *l, void *userdata) {
+ char *e, *c, *b;
+
+ b = l+strspn(l, WHITESPACE);
+
+ if ((c = strpbrk(b, COMMENTS)))
+ *c = 0;
+
+ if (!*b)
+ return 0;
+
+ if (startswith(b, ".include ")) {
+ char *path = NULL, *fn;
+ int r;
+
+ fn = strip(b+9);
+ if (!is_path_absolute(fn)) {
+ const char *k;
+
+ if ((k = strrchr(filename, '/'))) {
+ char *dir;
+
+ if (!(dir = strndup(filename, k-filename)))
+ return -ENOMEM;
+
+ if (asprintf(&path, "%s/%s", dir, fn) < 0)
+ return -errno;
+
+ fn = path;
+ free(dir);
+ }
+ }
+
+ r = config_parse(fn, t, userdata);
+ free(path);
+ return r;
+ }
+
+ if (*b == '[') {
+ size_t k;
+ char *n;
+
+ k = strlen(b);
+ assert(k > 0);
+
+ if (b[k-1] != ']') {
+ fprintf(stderr, "[%s:%u] Invalid section header.", filename, line);
+ return -EBADMSG;
+ }
+
+ if (!(n = strndup(b+1, k-2)))
+ return -ENOMEM;
+
+ free(*section);
+ *section = n;
+
+ return 0;
+ }
+
+ if (!(e = strchr(b, '='))) {
+ fprintf(stderr, "[%s:%u] Missing '='.", filename, line);
+ return -EBADMSG;
+ }
+
+ *e = 0;
+ e++;
+
+ return next_assignment(filename, line, *section, t, strip(b), strip(e), userdata);
+}
+
+/* Go through the file and parse each line */
+int config_parse(const char *filename, const ConfigItem *t, void *userdata) {
+ unsigned line = 0;
+ char *section = NULL;
+ FILE *f;
+ int r;
+
+ assert(filename);
+ assert(t);
+
+ if (!(f = fopen(filename, "re"))) {
+ r = -errno;
+ fprintf(stderr, "Failed to open configuration file '%s': %s", filename, strerror(-r));
+ goto finish;
+ }
+
+ while (!feof(f)) {
+ char l[LINE_MAX];
+
+ if (!fgets(l, sizeof(l), f)) {
+ if (feof(f))
+ break;
+
+ r = -errno;
+ fprintf(stderr, "Failed to read configuration file '%s': %s", filename, strerror(-r));
+ goto finish;
+ }
+
+ if ((r = parse_line(filename, ++line, &section, t, l, userdata)) < 0)
+ goto finish;
+ }
+
+ r = 0;
+
+finish:
+ free(section);
+
+ if (f)
+ fclose(f);
+
+ return r;
+}
+
+int config_parse_int(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ int *i = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if ((r = safe_atoi(rvalue, i)) < 0) {
+ fprintf(stderr, "[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
+ return r;
+ }
+
+ return 0;
+}
+
+int config_parse_unsigned(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ unsigned *u = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if ((r = safe_atou(rvalue, u)) < 0) {
+ fprintf(stderr, "[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
+ return r;
+ }
+
+ return 0;
+}
+
+int config_parse_size(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ size_t *sz = data;
+ unsigned u;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if ((r = safe_atou(rvalue, &u)) < 0) {
+ fprintf(stderr, "[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
+ return r;
+ }
+
+ *sz = (size_t) u;
+ return 0;
+}
+
+int config_parse_bool(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ int k;
+ bool *b = data;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if ((k = parse_boolean(rvalue)) < 0) {
+ fprintf(stderr, "[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
+ return k;
+ }
+
+ *b = !!k;
+ return 0;
+}
+
+int config_parse_string(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ char **s = data;
+ char *n;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if (*rvalue) {
+ if (!(n = strdup(rvalue)))
+ return -ENOMEM;
+ } else
+ n = NULL;
+
+ free(*s);
+ *s = n;
+
+ return 0;
+}
diff --git a/conf-parser.h b/conf-parser.h
new file mode 100644
index 0000000000..11f537918f
--- /dev/null
+++ b/conf-parser.h
@@ -0,0 +1,33 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+#ifndef fooconfparserhfoo
+#define fooconfparserhfoo
+
+#include <stdio.h>
+
+/* An abstract parser for simple, line based, shallow configuration
+ * files consisting of variable assignments only. */
+
+typedef int (*config_parser_cb_t)(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
+
+/* Wraps info for parsing a specific configuration variable */
+typedef struct ConfigItem {
+ const char *lvalue; /* name of the variable */
+ config_parser_cb_t parse; /* Function that is called to parse the variable's value */
+ void *data; /* Where to store the variable's data */
+ const char *section;
+} ConfigItem;
+
+/* The configuration file parsing routine. Expects a table of
+ * config_items in *t that is terminated by an item where lvalue is
+ * NULL */
+int config_parse(const char *filename, const ConfigItem *t, void *userdata);
+
+/* Generic parsers */
+int config_parse_int(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
+int config_parse_unsigned(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
+int config_parse_size(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
+int config_parse_bool(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
+int config_parse_string(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
+
+#endif