conf-parser: add ini/.desktop file parser
This commit is contained in:
Lennart Poettering
parent
1564322b24
commit
ed5bcfbe3c
2
Makefile
2
Makefile
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@ -1,7 +1,7 @@
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CFLAGS=-Wall -Wextra -O0 -g -pipe -D_GNU_SOURCE -fdiagnostics-show-option -Wno-unused-parameter
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LIBS=-lrt
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systemd: main.o name.o util.o set.o hashmap.o strv.o job.o manager.o
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systemd: main.o name.o util.o set.o hashmap.o strv.o job.o manager.o conf-parser.o
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$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
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clean:
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@ -0,0 +1,321 @@
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/*-*- Mode: C; c-basic-offset: 8 -*-*/
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <assert.h>
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#include <stdlib.h>
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#include "conf-parser.h"
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#include "util.h"
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#include "macro.h"
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#define WHITESPACE " \t\n"
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#define COMMENTS "#;\n"
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#define LINE_MAX 4096
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/* Run the user supplied parser for an assignment */
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static int next_assignment(
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const char *filename,
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unsigned line,
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const char *section,
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const ConfigItem *t,
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const char *lvalue,
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const char *rvalue,
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void *userdata) {
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assert(filename);
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assert(t);
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assert(lvalue);
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assert(rvalue);
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for (; t->parse; t++) {
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if (t->lvalue && !streq(lvalue, t->lvalue))
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continue;
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if (t->section && !section)
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continue;
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if (t->section && !streq(section, t->section))
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continue;
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return t->parse(filename, line, section, lvalue, rvalue, t->data, userdata);
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}
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fprintf(stderr, "[%s:%u] Unknown lvalue '%s' in section '%s'.", filename, line, lvalue, strna(section));
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return -EBADMSG;
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}
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/* Returns non-zero when c is contained in s */
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static int in_string(char c, const char *s) {
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assert(s);
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for (; *s; s++)
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if (*s == c)
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return 1;
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return 0;
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}
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/* Remove all whitepsapce from the beginning and the end of *s. *s may
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* be modified. */
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static char *strip(char *s) {
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char *b = s+strspn(s, WHITESPACE);
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char *e, *l = NULL;
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for (e = b; *e; e++)
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if (!in_string(*e, WHITESPACE))
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l = e;
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if (l)
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*(l+1) = 0;
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return b;
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}
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/* Parse a variable assignment line */
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static int parse_line(const char *filename, unsigned line, char **section, const ConfigItem *t, char *l, void *userdata) {
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char *e, *c, *b;
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b = l+strspn(l, WHITESPACE);
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if ((c = strpbrk(b, COMMENTS)))
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*c = 0;
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if (!*b)
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return 0;
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if (startswith(b, ".include ")) {
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char *path = NULL, *fn;
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int r;
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fn = strip(b+9);
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if (!is_path_absolute(fn)) {
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const char *k;
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if ((k = strrchr(filename, '/'))) {
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char *dir;
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if (!(dir = strndup(filename, k-filename)))
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return -ENOMEM;
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if (asprintf(&path, "%s/%s", dir, fn) < 0)
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return -errno;
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fn = path;
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free(dir);
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}
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}
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r = config_parse(fn, t, userdata);
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free(path);
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return r;
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}
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if (*b == '[') {
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size_t k;
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char *n;
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k = strlen(b);
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assert(k > 0);
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if (b[k-1] != ']') {
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fprintf(stderr, "[%s:%u] Invalid section header.", filename, line);
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return -EBADMSG;
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}
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if (!(n = strndup(b+1, k-2)))
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return -ENOMEM;
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free(*section);
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*section = n;
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return 0;
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}
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if (!(e = strchr(b, '='))) {
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fprintf(stderr, "[%s:%u] Missing '='.", filename, line);
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return -EBADMSG;
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}
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*e = 0;
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e++;
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return next_assignment(filename, line, *section, t, strip(b), strip(e), userdata);
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}
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/* Go through the file and parse each line */
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int config_parse(const char *filename, const ConfigItem *t, void *userdata) {
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unsigned line = 0;
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char *section = NULL;
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FILE *f;
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int r;
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assert(filename);
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assert(t);
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if (!(f = fopen(filename, "re"))) {
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r = -errno;
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fprintf(stderr, "Failed to open configuration file '%s': %s", filename, strerror(-r));
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goto finish;
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}
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while (!feof(f)) {
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char l[LINE_MAX];
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if (!fgets(l, sizeof(l), f)) {
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if (feof(f))
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break;
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r = -errno;
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fprintf(stderr, "Failed to read configuration file '%s': %s", filename, strerror(-r));
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goto finish;
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}
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if ((r = parse_line(filename, ++line, §ion, t, l, userdata)) < 0)
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goto finish;
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}
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r = 0;
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finish:
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free(section);
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if (f)
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fclose(f);
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return r;
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}
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int config_parse_int(
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const char *filename,
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unsigned line,
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const char *section,
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const char *lvalue,
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const char *rvalue,
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void *data,
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void *userdata) {
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int *i = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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if ((r = safe_atoi(rvalue, i)) < 0) {
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fprintf(stderr, "[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
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return r;
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}
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return 0;
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}
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int config_parse_unsigned(
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const char *filename,
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unsigned line,
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const char *section,
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const char *lvalue,
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const char *rvalue,
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void *data,
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void *userdata) {
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unsigned *u = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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if ((r = safe_atou(rvalue, u)) < 0) {
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fprintf(stderr, "[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
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return r;
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}
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return 0;
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}
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int config_parse_size(
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const char *filename,
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unsigned line,
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const char *section,
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const char *lvalue,
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const char *rvalue,
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void *data,
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void *userdata) {
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size_t *sz = data;
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unsigned u;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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if ((r = safe_atou(rvalue, &u)) < 0) {
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fprintf(stderr, "[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
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return r;
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}
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*sz = (size_t) u;
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return 0;
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}
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int config_parse_bool(
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const char *filename,
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unsigned line,
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const char *section,
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const char *lvalue,
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const char *rvalue,
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void *data,
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void *userdata) {
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int k;
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bool *b = data;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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if ((k = parse_boolean(rvalue)) < 0) {
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fprintf(stderr, "[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
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return k;
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}
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*b = !!k;
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return 0;
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}
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int config_parse_string(
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const char *filename,
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unsigned line,
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const char *section,
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const char *lvalue,
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const char *rvalue,
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void *data,
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void *userdata) {
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char **s = data;
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char *n;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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if (*rvalue) {
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if (!(n = strdup(rvalue)))
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return -ENOMEM;
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} else
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n = NULL;
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free(*s);
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*s = n;
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return 0;
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}
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@ -0,0 +1,33 @@
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/*-*- Mode: C; c-basic-offset: 8 -*-*/
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#ifndef fooconfparserhfoo
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#define fooconfparserhfoo
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#include <stdio.h>
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/* An abstract parser for simple, line based, shallow configuration
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* files consisting of variable assignments only. */
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typedef int (*config_parser_cb_t)(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
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/* Wraps info for parsing a specific configuration variable */
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typedef struct ConfigItem {
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const char *lvalue; /* name of the variable */
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config_parser_cb_t parse; /* Function that is called to parse the variable's value */
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void *data; /* Where to store the variable's data */
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const char *section;
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} ConfigItem;
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/* The configuration file parsing routine. Expects a table of
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* config_items in *t that is terminated by an item where lvalue is
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* NULL */
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int config_parse(const char *filename, const ConfigItem *t, void *userdata);
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/* Generic parsers */
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int config_parse_int(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
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int config_parse_unsigned(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
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int config_parse_size(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
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int config_parse_bool(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
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int config_parse_string(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
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#endif
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