package/openwrt/include/shutils.h

   1 /*
   2  * Shell-like utility functions
   3  *
   4  * Copyright 2004, Broadcom Corporation
   5  * All Rights Reserved.
   6  *
   7  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   8  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   9  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  10  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  11  *
  12  * $Id$
  13  */
  14
  15 #ifndef _shutils_h_
  16 #define _shutils_h_
  17 #include <string.h>
  18 /*
  19  * Reads file and returns contents
  20  * @param       fd      file descriptor
  21  * @return      contents of file or NULL if an error occurred
  22  */
  23 extern char * fd2str(int fd);
  24
  25 /*
  26  * Reads file and returns contents
  27  * @param       path    path to file
  28  * @return      contents of file or NULL if an error occurred
  29  */
  30 extern char * file2str(const char *path);
  31
  32 /*
  33  * Waits for a file descriptor to become available for reading or unblocked signal
  34  * @param       fd      file descriptor
  35  * @param       timeout seconds to wait before timing out or 0 for no timeout
  36  * @return      1 if descriptor changed status or 0 if timed out or -1 on error
  37  */
  38 extern int waitfor(int fd, int timeout);
  39
  40 /*
  41  * Concatenates NULL-terminated list of arguments into a single
  42  * commmand and executes it
  43  * @param       argv    argument list
  44  * @param       path    NULL, ">output", or ">>output"
  45  * @param       timeout seconds to wait before timing out or 0 for no timeout
  46  * @param       ppid    NULL to wait for child termination or pointer to pid
  47  * @return      return value of executed command or errno
  48  */
  49 extern int _eval(char *const argv[], char *path, int timeout, pid_t *ppid);
  50
  51 /*
  52  * Concatenates NULL-terminated list of arguments into a single
  53  * commmand and executes it
  54  * @param       argv    argument list
  55  * @return      stdout of executed command or NULL if an error occurred
  56  */
  57 extern char * _backtick(char *const argv[]);
  58
  59 /*
  60  * Kills process whose PID is stored in plaintext in pidfile
  61  * @param       pidfile PID file
  62  * @return      0 on success and errno on failure
  63  */
  64 extern int kill_pidfile(char *pidfile);
  65
  66 /*
  67  * fread() with automatic retry on syscall interrupt
  68  * @param       ptr     location to store to
  69  * @param       size    size of each element of data
  70  * @param       nmemb   number of elements
  71  * @param       stream  file stream
  72  * @return      number of items successfully read
  73  */
  74 extern int safe_fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
  75
  76 /*
  77  * fwrite() with automatic retry on syscall interrupt
  78  * @param       ptr     location to read from
  79  * @param       size    size of each element of data
  80  * @param       nmemb   number of elements
  81  * @param       stream  file stream
  82  * @return      number of items successfully written
  83  */
  84 extern int safe_fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
  85
  86 /*
  87  * Convert Ethernet address string representation to binary data
  88  * @param       a       string in xx:xx:xx:xx:xx:xx notation
  89  * @param       e       binary data
  90  * @return      TRUE if conversion was successful and FALSE otherwise
  91  */
  92 extern int ether_atoe(const char *a, unsigned char *e);
  93
  94 /*
  95  * Convert Ethernet address binary data to string representation
  96  * @param       e       binary data
  97  * @param       a       string in xx:xx:xx:xx:xx:xx notation
  98  * @return      a
  99  */
 100 extern char * ether_etoa(const unsigned char *e, char *a);
 101
 102 /*
 103  * Concatenate two strings together into a caller supplied buffer
 104  * @param       s1      first string
 105  * @param       s2      second string
 106  * @param       buf     buffer large enough to hold both strings
 107  * @return      buf
 108  */
 109 static inline char * strcat_r(const char *s1, const char *s2, char *buf)
 110 {
 111         strcpy(buf, s1);
 112         strcat(buf, s2);
 113         return buf;
 114 }
 115
 116 /* Check for a blank character; that is, a space or a tab */
 117 #define isblank(c) ((c) == ' ' || (c) == '\t')
 118
 119 /* Strip trailing CR/NL from string <s> */
 120 #define chomp(s) ({ \
 121         char *c = (s) + strlen((s)) - 1; \
 122         while ((c > (s)) && (*c == '\n' || *c == '\r' || *c == ' ')) \
 123                 *c-- = '\0'; \
 124         s; \
 125 })
 126
 127 /* Simple version of _backtick() */
 128 #define backtick(cmd, args...) ({ \
 129         char *argv[] = { cmd, ## args, NULL }; \
 130         _backtick(argv); \
 131 })
 132
 133 /* Simple version of _eval() (no timeout and wait for child termination) */
 134 #define eval(cmd, args...) ({ \
 135         char *argv[] = { cmd, ## args, NULL }; \
 136         _eval(argv, ">/dev/console", 0, NULL); \
 137 })
 138
 139 /* Copy each token in wordlist delimited by space into word */
 140 #define foreach(word, wordlist, next) \
 141         for (next = &wordlist[strspn(wordlist, " ")], \
 142              strncpy(word, next, sizeof(word)), \
 143              word[strcspn(word, " ")] = '\0', \
 144              word[sizeof(word) - 1] = '\0', \
 145              next = strchr(next, ' '); \
 146              strlen(word); \
 147              next = next ? &next[strspn(next, " ")] : "", \
 148              strncpy(word, next, sizeof(word)), \
 149              word[strcspn(word, " ")] = '\0', \
 150              word[sizeof(word) - 1] = '\0', \
 151              next = strchr(next, ' '))
 152
 153 /* Return NUL instead of NULL if undefined */
 154 #define safe_getenv(s) (getenv(s) ? : "")
 155
 156 /* Print directly to the console */
 157 #define cprintf(fmt, args...) do { \
 158         FILE *fp = fopen("/dev/console", "w"); \
 159         if (fp) { \
 160                 fprintf(fp, fmt, ## args); \
 161                 fclose(fp); \
 162         } \
 163 } while (0)
 164
 165 /* Debug print */
 166 #ifdef DEBUG
 167 #define dprintf(fmt, args...) cprintf("%s: " fmt, __FUNCTION__, ## args)
 168 #else
 169 #define dprintf(fmt, args...)
 170 #endif
 171
 172 #ifdef vxworks
 173
 174 #include <inetLib.h>
 175 #define inet_aton(a, n) ((inet_aton((a), (n)) == ERROR) ? 0 : 1)
 176 #define inet_ntoa(n) ({ char a[INET_ADDR_LEN]; inet_ntoa_b ((n), a); a; })
 177
 178 #include <typedefs.h>
 179 #include <bcmutils.h>
 180 #define ether_atoe(a, e) bcm_ether_atoe((a), (e))
 181 #define ether_etoa(e, a) bcm_ether_ntoa((e), (a))
 182
 183 /* These declarations are not available where you would expect them */
 184 extern int vsnprintf (char *, size_t, const char *, va_list);
 185 extern int snprintf(char *str, size_t count, const char *fmt, ...);
 186 extern char *strdup(const char *);
 187 extern char *strsep(char **stringp, char *delim);
 188 extern int strcasecmp(const char *s1, const char *s2);
 189 extern int strncasecmp(const char *s1, const char *s2, size_t n);
 190
 191 /* Neither are socket() and connect() */
 192 #include <sockLib.h>
 193
 194 #ifdef DEBUG
 195 #undef dprintf
 196 #define dprintf printf
 197 #endif
 198 #endif
 199
 200 #endif /* _shutils_h_ */