113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
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/*
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** Copyright 2012, The CyanogenMod Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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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 <unistd.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "utils.h"
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/* reads a file, making sure it is terminated with \n \0 */
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char* read_file(const char *fn)
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{
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struct stat st;
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char *data = NULL;
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int fd = open(fn, O_RDONLY);
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if (fd < 0) return data;
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if (fstat(fd, &st)) goto oops;
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data = malloc(st.st_size + 2);
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if (!data) goto oops;
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if (read(fd, data, st.st_size) != st.st_size) goto oops;
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close(fd);
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data[st.st_size] = '\n';
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data[st.st_size + 1] = 0;
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return data;
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oops:
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close(fd);
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if (data) free(data);
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return NULL;
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}
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int get_property(const char *data, char *found, const char *searchkey, const char *not_found)
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{
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char *key, *value, *eol, *sol, *tmp;
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if (data == NULL) goto defval;
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int matched = 0;
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sol = strdup(data);
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while((eol = strchr(sol, '\n'))) {
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key = sol;
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*eol++ = 0;
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sol = eol;
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value = strchr(key, '=');
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if(value == 0) continue;
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*value++ = 0;
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while(isspace(*key)) key++;
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if(*key == '#') continue;
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tmp = value - 2;
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while((tmp > key) && isspace(*tmp)) *tmp-- = 0;
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while(isspace(*value)) value++;
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tmp = eol - 2;
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while((tmp > value) && isspace(*tmp)) *tmp-- = 0;
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if (strncmp(searchkey, key, strlen(searchkey)) == 0) {
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matched = 1;
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break;
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}
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}
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int len;
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if (matched) {
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len = strlen(value);
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if (len >= PROPERTY_VALUE_MAX)
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return -1;
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memcpy(found, value, len + 1);
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} else goto defval;
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return len;
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defval:
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len = strlen(not_found);
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memcpy(found, not_found, len + 1);
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return len;
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}
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/*
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* Fast version of get_property which purpose is to check
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* whether the property with given prefix exists.
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*
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* Assume nobody is stupid enough to put a propery with prefix ro.cm.version
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* in his build.prop on a non-CM ROM and comment it out.
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*/
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int check_property(const char *data, const char *prefix)
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{
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if (!data)
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return 0;
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return strstr(data, prefix) != NULL;
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}
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