strerror_override.c

  1 #define STRERROR_OVERRIDE_IMPL 1
  2 #include "strerror_override.h"
  3 
  4 /*
  5  * Override strerror() to get consistent output across platforms.
  6  */
  7 
  8 static struct
  9 {
 10         int errno_value;
 11         const char *errno_str;
 12 } errno_list[] = {
 13 /* clang-format off */
 14 #define STRINGIFY(x) #x
 15 #define ENTRY(x) {x, &STRINGIFY(undef_ ## x)[6]}
 16         ENTRY(EPERM),
 17         ENTRY(ENOENT),
 18         ENTRY(ESRCH),
 19         ENTRY(EINTR),
 20         ENTRY(EIO),
 21         ENTRY(ENXIO),
 22         ENTRY(E2BIG),
 23 #ifdef ENOEXEC
 24         ENTRY(ENOEXEC),
 25 #endif
 26         ENTRY(EBADF),
 27         ENTRY(ECHILD),
 28         ENTRY(EDEADLK),
 29         ENTRY(ENOMEM),
 30         ENTRY(EACCES),
 31         ENTRY(EFAULT),
 32 #ifdef ENOTBLK
 33         ENTRY(ENOTBLK),
 34 #endif
 35         ENTRY(EBUSY),
 36         ENTRY(EEXIST),
 37         ENTRY(EXDEV),
 38         ENTRY(ENODEV),
 39         ENTRY(ENOTDIR),
 40         ENTRY(EISDIR),
 41         ENTRY(EINVAL),
 42         ENTRY(ENFILE),
 43         ENTRY(EMFILE),
 44         ENTRY(ENOTTY),
 45 #ifdef ETXTBSY
 46         ENTRY(ETXTBSY),
 47 #endif
 48         ENTRY(EFBIG),
 49         ENTRY(ENOSPC),
 50         ENTRY(ESPIPE),
 51         ENTRY(EROFS),
 52         ENTRY(EMLINK),
 53         ENTRY(EPIPE),
 54         ENTRY(EDOM),
 55         ENTRY(ERANGE),
 56         ENTRY(EAGAIN),
 57         { 0, (char *)0 }
 58 };
 59 /* clang-format on */
 60 
 61 // Enabled during tests
 62 static int _json_c_strerror_enable = 0;
 63 extern char *getenv(const char *name); // Avoid including stdlib.h
 64 
 65 #define PREFIX "ERRNO="
 66 static char errno_buf[128] = PREFIX;
 67 char *_json_c_strerror(int errno_in)
 68 {
 69         int start_idx;
 70         char digbuf[20];
 71         int ii, jj;
 72 
 73         if (!_json_c_strerror_enable)
 74                 _json_c_strerror_enable = (getenv("_JSON_C_STRERROR_ENABLE") == NULL) ? -1 : 1;
 75         if (_json_c_strerror_enable == -1)
 76                 return strerror(errno_in);
 77 
 78         // Avoid standard functions, so we don't need to include any
 79         // headers, or guess at signatures.
 80 
 81         for (ii = 0; errno_list[ii].errno_str != (char *)0; ii++)
 82         {
 83                 const char *errno_str = errno_list[ii].errno_str;
 84                 if (errno_list[ii].errno_value != errno_in)
 85                         continue;
 86 
 87                 for (start_idx = sizeof(PREFIX) - 1, jj = 0; errno_str[jj] != '\0';
 88                      jj++, start_idx++)
 89                 {
 90                         errno_buf[start_idx] = errno_str[jj];
 91                 }
 92                 errno_buf[start_idx] = '\0';
 93                 return errno_buf;
 94         }
 95 
 96         // It's not one of the known errno values, return the numeric value.
 97         for (ii = 0; errno_in > 10; errno_in /= 10, ii++)
 98         {
 99                 digbuf[ii] = "0123456789"[(errno_in % 10)];
100         }
101         digbuf[ii] = "0123456789"[(errno_in % 10)];
102 
103         // Reverse the digits
104         for (start_idx = sizeof(PREFIX) - 1; ii >= 0; ii--, start_idx++)
105         {
106                 errno_buf[start_idx] = digbuf[ii];
107         }
108         return errno_buf;
109 }
110
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Sources/json-c/strerror_override.c
