1 /* Author: Mark Goldman <mgoldman (at) tresys.com> 2 * 3 * Copyright (C) 2007 Tresys Technology, LLC 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Lesser General Public 7 * License as published by the Free Software Foundation; either 8 * version 2.1 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Lesser General Public License for more details. 14 * 15 * You should have received a copy of the GNU Lesser General Public 16 * License along with this library; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 /* This file contains helper functions that are loosely based off of what is 21 * available from the python script genhomedircon. Also this file contains 22 * c implementations of a couple of python functions so that genhomedircon will 23 * look/act like the python script. 24 */ 25 #ifndef _SEMANAGE_UTILITIES_H_ 26 #define _SEMANAGE_UTILITIES_H_ 27 28 #include <stdio.h> 29 30 #if defined(__GNUC__) && !defined(__STRICT_ANSI__) 31 #define WARN_UNUSED \ 32 __attribute__ ((__warn_unused_result__)) 33 #else 34 # define WARN_UNUSED /* nothing */ 35 #endif 36 37 typedef struct list { 38 char *data; 39 struct list *next; 40 } semanage_list_t; 41 42 /** 43 * @param file the path to the file to look for a variable in 44 * @param var the variable that you want the value of 45 * @param delim the value that separates the part you care about from the part 46 * that you don't. 47 * @return for the first instance of var in the file, returns everything after 48 * delim. 49 * returns "" if not found IE if(*(semanage_findval(f,v,d)) == '\0'){ 50 * printf("%s not found in file", v); 51 * } 52 * 53 * NULL for error (out of memory, etc) 54 */ 55 char *semanage_findval(const char *file, const char *var, const char *delim) WARN_UNUSED; 56 57 /** 58 * @param str string to test 59 * @param val prefix 60 * @return 1 if val is the prefix of str 61 * 0 if val is not the prefix of str 62 * 63 * note: if str == NULL, returns false 64 * if val == NULL, returns true --nothing can always be the prefix of 65 * something 66 * if (*val) == "" returns true same as above. 67 */ 68 int semanage_is_prefix(const char *str, const char *val) WARN_UNUSED; 69 70 /** 71 * @param str the string to semanage_split 72 * @return malloc'd string after the first run of charachters that aren't whitespace 73 */ 74 char *semanage_split_on_space(const char *str) WARN_UNUSED; 75 76 /** 77 * @param str the string to semanage_split 78 * @param delim the string delimiter. NOT a set of charachters that can be 79 * a delimiter. 80 * if *delim == '\0' behaves as semanage_splitOnSpace() 81 * @return a ptr to the first charachter past the delimiter. 82 * if delim doesn't appear in the string, returns a ptr to the 83 * trailing null in the string 84 */ 85 char *semanage_split(const char *str, const char *delim) WARN_UNUSED; 86 87 /* linked list string functions 88 * Functions allocate memory. Must be free'd with 89 * either semanage_list_pop until list == NULL or semanage_list_destroy() 90 */ 91 int semanage_list_push(semanage_list_t ** list, const char *data) WARN_UNUSED; 92 char *semanage_list_pop(semanage_list_t ** list); 93 void semanage_list_destroy(semanage_list_t ** list); 94 semanage_list_t *semanage_list_find(semanage_list_t * l, 95 const char *data) WARN_UNUSED; 96 int semanage_list_sort(semanage_list_t ** l) WARN_UNUSED; 97 /* function to compare 2 semanage_list_t nodes, 98 * returns strcmp(x->data, y->data) 99 * used internally by semanage_list_sort() 100 */ 101 int semanage_cmp_plist_t(const semanage_list_t ** x, 102 const semanage_list_t ** y); 103 /** 104 * @param data a target string 105 * @param what a charachter 106 * @returns the number of times the char appears in the string 107 */ 108 int semanage_str_count(const char *data, char what); 109 /** 110 * @param - a string 111 * @param the charachter to trim to 112 * @return - mangles the string, converting the first 113 * occurrance of the charachter to a '\0' from 114 * the end of the string. 115 */ 116 void semanage_rtrim(char *str, char trim_to); 117 118 /** 119 * @param value being searched for 120 * @param replacement value that replaces found search values 121 * @param string being searched and replaced on 122 * @param maximum number of value occurences (zero for unlimited) 123 * @return newly-allocated string with the replaced values 124 */ 125 char *semanage_str_replace(const char *search, const char *replace, 126 const char *src, size_t lim); 127 128 /** 129 * @param data some string 130 * @return modifies the string such that the first whitespace char becomes 131 * '\0', ending the string. 132 */ 133 void semanage_keep_until_space(char *data); 134 135 /** 136 * @param file - an open FILE to read from 137 * @param pred - a function taking a string that 138 * returns 1 if the string should be 139 * kept and 0 otherwise 140 * @return a list of lines from the file (empty lines become 141 * empty strings) in the file order where pred(line) 142 * returns > 0 143 */ 144 semanage_list_t *semanage_slurp_file_filter(FILE * file, 145 int (*pred) (const char *)) 146 WARN_UNUSED; 147 #endif 148
