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303 lines
6.2 KiB
303 lines
6.2 KiB
/*
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* Copyright © 2013 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "overlay.h"
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#define DEFAULT_SECTION "window"
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static const char *skip_whitespace(const char *s, const char *end)
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{
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while (s < end && isspace(*s))
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s++;
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return s;
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}
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static const char *trim_whitespace(const char *s, const char *end)
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{
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if (end == NULL)
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return end;
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while (end > s && isspace(*--end))
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;
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return end + 1;
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}
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static int is_eol(int c)
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{
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return c == '\n' || c == '\r';
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}
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static const char *skip_past_eol(const char *s, const char *end)
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{
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while (s < end && !is_eol(*s++))
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;
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return s;
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}
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static const char *find(const char *s, const char *end, int c)
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{
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while (s < end && *s != c) {
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if (*s == '#')
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break;
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if (*s == '\n')
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return NULL;
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s++;
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}
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return c == '\n' ? s : s < end ? s : NULL;
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}
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static int parse(const char *buf, int len,
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int (*func)(const char *section,
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const char *name,
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const char *value,
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void *data),
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void *data)
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{
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char section[128] = DEFAULT_SECTION, name[128], value[128];
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const char *buf_end = buf + len;
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const char *end;
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int has_section = 0;
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int line;
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for (line = 0 ; ++line; buf = skip_past_eol(buf, buf_end)) {
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buf = skip_whitespace(buf, buf_end);
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if (buf >= buf_end)
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break;
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if (*buf == ';' || *buf == '#') {
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/* comment */
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} else if (*buf == '[') { /* new section */
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end = find(++buf, buf_end, ']');
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if (end == NULL)
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return line;
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end = trim_whitespace(buf, end);
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if (end <= buf)
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continue;
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len = end - buf;
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if (len == 0 || len >= sizeof(section))
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return line;
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memcpy(section, buf, len);
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section[len] = '\0';
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has_section = 1;
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} else { /* name = value */
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const char *sep;
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int has_value = 1;
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sep = find(buf, buf_end, '=');
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if (sep == NULL)
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sep = find(buf, buf_end, ':');
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if (sep == NULL) {
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sep = find(buf, buf_end, '\n');
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has_value = 0;
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}
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end = trim_whitespace(buf, sep);
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if (end <= buf)
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continue;
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len = end - buf;
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if (len == 0 || len >= sizeof(name))
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return line;
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memcpy(name, buf, len);
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name[len] = '\0';
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if (has_value) {
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buf = skip_whitespace(sep + 1, buf_end);
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end = find(buf, buf_end, '\n');
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end = trim_whitespace(buf, end);
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len = end - buf;
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if (len >= sizeof(name))
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return line;
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memcpy(value, buf, len);
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value[len] = '\0';
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} else
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*value = '\0';
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if (!has_section) {
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char *dot;
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dot = strchr(name, '.');
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if (dot && dot[1]) {
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*dot = '\0';
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if (!func(name, dot+1, value, data))
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return line;
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continue;
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}
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}
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if (!func(section, name, value, data))
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return line;
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}
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}
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return 0;
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}
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static int add_value(const char *section,
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const char *name,
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const char *value,
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void *data)
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{
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struct config *c = data;
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struct config_section *s;
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struct config_value *v, **prev;
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for (s = c->sections; s != NULL; s = s->next)
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if (strcmp(s->name, section) == 0)
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break;
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if (s == NULL) {
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int len = strlen(section) + 1;
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s = malloc(sizeof(*s)+len);
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if (s == NULL)
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return 0;
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memcpy(s->name, section, len);
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s->values = NULL;
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s->next = c->sections;
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c->sections = s;
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}
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for (prev = &s->values; (v = *prev) != NULL; prev = &v->next) {
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if (strcmp(v->name, name) == 0) {
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*prev = v->next;
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free(v);
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break;
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}
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}
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{
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int name_len = strlen(name) + 1;
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int value_len = strlen(value) + 1;
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v = malloc(sizeof(*v) + name_len + value_len);
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if (v == NULL)
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return 0;
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v->name = memcpy(v+1, name, name_len);
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v->value = memcpy(v->name + name_len, value, value_len);
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v->next = s->values;
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s->values = v;
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}
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return 1;
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}
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static int config_init_from_file(struct config *config, const char *filename)
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{
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struct stat st;
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int fd, err = -1;
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char *str;
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fd = open(filename, 0);
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if (fd < 0)
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return -1;
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if (fstat(fd, &st) < 0)
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goto err_fd;
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if ((str = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == (void *)-1)
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goto err_fd;
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err = parse(str, st.st_size, add_value, config);
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munmap(str, st.st_size);
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err_fd:
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close(fd);
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return err;
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}
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void config_init(struct config *config)
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{
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memset(config, 0, sizeof(*config));
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}
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void config_parse_string(struct config *config, const char *str)
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{
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int err;
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if (str == NULL)
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return;
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err = config_init_from_file(config, str);
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if (err == -1)
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err = parse(str, strlen(str), add_value, config);
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if (err) {
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fprintf(stderr, "Failed to parse config string at line %d\n", err);
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exit(1);
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}
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}
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void config_set_value(struct config *c,
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const char *section,
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const char *name,
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const char *value)
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{
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add_value(section, name, value, c);
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}
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const char *config_get_value(struct config *c,
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const char *section,
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const char *name)
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{
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struct config_section *s;
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struct config_value *v;
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for (s = c->sections; s != NULL; s = s->next) {
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if (strcmp(s->name, section))
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continue;
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for (v = s->values; v != NULL; v = v->next) {
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if (strcmp(v->name, name))
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continue;
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return v->value;
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}
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}
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return NULL;
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}
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