Magisk/utils.c
topjohnwu 3dfcc6b0be Checkout from seSuperuser/Superuser, leaving only native parts
- Checkout from https://github.com/seSuperuser/Superuser (commit: 69f84dd7a035b4a9f18dea69d9e0452bf0f73103)
- Move Superuser/Superuser/jni/su/* to root
- Move Superuser/jni/sqlite3/* to sqlite3
2018-07-18 18:12:47 +08:00

113 lines
2.8 KiB
C

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