418 lines
10 KiB
C
418 lines
10 KiB
C
/*-*- 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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#include "strv.h"
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#include "log.h"
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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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log_error("[%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 char* const * sections, 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, NULL, sections, 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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log_error("[%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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if (sections) {
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const char * const * i;
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bool good = false;
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STRV_FOREACH(i, sections)
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if (streq(*i, n)) {
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good = true;
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break;
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}
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if (!good) {
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free(n);
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return -EBADMSG;
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}
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}
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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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log_error("[%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, FILE *f, const char* const * sections, const ConfigItem *t, void *userdata) {
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unsigned line = 0;
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char *section = NULL;
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int r;
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assert(filename);
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assert(t);
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if (!f) {
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if (!(f = fopen(filename, "re"))) {
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r = -errno;
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log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
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goto finish;
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}
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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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log_error("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, sections, 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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log_error("[%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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log_error("[%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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log_error("[%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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log_error("[%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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int config_parse_path(
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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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log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
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return -EINVAL;
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}
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if (!(n = strdup(rvalue)))
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return -ENOMEM;
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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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int config_parse_strv(
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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*** sv = data;
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char **n;
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char *w;
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unsigned k;
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size_t l;
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char *state;
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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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k = strv_length(*sv);
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FOREACH_WORD_QUOTED(w, l, rvalue, state)
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k++;
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if (!(n = new(char*, k+1)))
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return -ENOMEM;
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for (k = 0; (*sv)[k]; k++)
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n[k] = (*sv)[k];
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FOREACH_WORD_QUOTED(w, l, rvalue, state)
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if (!(n[k++] = strndup(w, l)))
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goto fail;
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n[k] = NULL;
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free(*sv);
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*sv = n;
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return 0;
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fail:
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for (; k > 0; k--)
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free(n[k-1]);
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free(n);
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return -ENOMEM;
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}
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