src/utils.h

   1 #ifndef __ISDS_UTILS_H__
   2 #define __ISDS_UTILS_H__
   3
   4 #include <stdlib.h>
   5 #include <stdarg.h>
   6 #include <stdio.h>
   7 #include <time.h>
   8
   9 /* _hidden macro marks library private symbols. GCC can exclude them from global
  10  * symbols table */
  11 #if defined(__GNUC__) && (__GNUC__ >= 4) && !defined(_WIN32)
  12 #define _hidden __attribute__((visibility("hidden")))
  13 #else
  14 #define _hidden
  15 #endif
  16
  17 /* PANIC macro aborts current process without any clean up.
  18  * Use it as last resort fatal error solution */
  19 #define PANIC(message) { \
  20     if (stderr != NULL ) fprintf(stderr, \
  21             "LIBISDS PANIC (%s:%d): %s\n", __FILE__, __LINE__, (message)); \
  22     abort(); \
  23 }
  24
  25 /* Concatenate two strings into newly allocated buffer.
  26  * You must free() them, when you don't need it anymore.
  27  * Any of the arguments can be NULL meaning empty string.
  28  * In case of error returns NULL.
  29  * Empty string is always returned as allocated empty string. */
  30 char *_isds_astrcat(const char *first, const char *second);
  31
  32 /* Concatenate three strings into newly allocated buffer.
  33  * You must free() them, when you don't need it anymore.
  34  * Any of the arguments can be NULL meaning empty string.
  35  * In case of error returns NULL.
  36  * Empty string is always returned as allocated empty string. */
  37 char *_isds_astrcat3(const char *first, const char *second,
  38         const char *third);
  39
  40 /* Print formatted string into automatically reallocated @buffer.
  41  * @buffer automatically reallocated buffer. Must be &NULL or preallocated
  42  * memory.
  43  * @format format string as for printf(3)
  44  * @ap list of variadic arguments, after call will be in undefined state
  45  * @Returns number of bytes printed. In case of error, -1 and NULL @buffer*/
  46 int isds_vasprintf(char **buffer, const char *format, va_list ap);
  47
  48 /* Print formatted string into automatically reallocated @buffer.
  49  * @buffer automatically reallocated buffer. Must be &NULL or preallocated
  50  * memory.
  51  * @format format string as for printf(3)
  52  * @... variadic arguments
  53  * @Returns number of bytes printed. In case of error, -1 and NULL @buffer */
  54 int isds_asprintf(char **buffer, const char *format, ...);
  55
  56 /* Converts a block from charset to charset.
  57  * @from is input charset of @input block as known to iconv
  58  * @to is output charset @input will be converted to @output
  59  * @input is block in @from charset/encoding of length @input_length
  60  * @input_length is size of @input block in bytes
  61  * @output is automatically allocated block of data converted from @input. No
  62  * NUL is apended. Can be NULL, if resulting size is 0. You must free it.
  63  * @return size of @output in bytes. In case of error returns (size_t) -1 and
  64  * deallocates @output if this function allocated it in this call. */
  65 _hidden size_t _isds_any2any(const char *from, const char *to,
  66         const void *input, size_t input_length, void **output);
  67
  68 /* Converts UTF8 string into locale encoded string.
  69  * @utf string int UTF-8 terminated by zero byte
  70  * @return allocated string encoded in locale specific encoding. You must free
  71  * it. In case of error or NULL @utf returns NULL. */
  72 char *_isds_utf82locale(const char *utf);
  73
  74 /* Encode given data into MIME Base64 encoded zero terminated string.
  75  * @plain are input data (binary stream)
  76  * @length is length of @plain data in bytes
  77  * @return allocated string of base64 encoded plain data or NULL in case of
  78  * error. You must free it. */
  79 char *_isds_b64encode(const void *plain, const size_t length);
  80
  81 /* Decode given data from MIME Base64 encoded zero terminated string to binary
  82  * stream. Invalid Base64 symbols are skipped.
  83  * @encoded are input data (Base64 zero terminated string)
  84  * @plain are automatically reallocated output data (binary stream). You must
  85  * free it. Will be freed in case of error.
  86  * @return length of @plain data in bytes or (size_t) -1 in case of memory
  87  * allocation failure. */
  88 size_t _isds_b64decode(const char *encoded, void **plain);
  89
  90 /* Convert hexadecimal digit to integer. Return negative value if character is
  91  * not valid hexadecimal digit. */
  92 int _isds_hex2i(char digit);
  93
  94 /* Convert UTC broken time to time_t.
  95  * @broken_utc it time in UTC in broken format. Despite its content is not
  96  * touched, it'sw not-const because underlying POSIX function has non-const
  97  * signature.
  98  * @return (time_t) -1 in case of error */
  99 time_t _isds_timegm(struct tm *broken_utc);
 100
 101 /* Free() and set to NULL pointed memory */
 102 #define zfree(memory) { \
 103     free(memory); \
 104     (memory) = NULL; \
 105 }
 106
 107 #endif