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#define STRERROR_OVERRIDE_IMPL 1 |
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#include "strerror_override.h" |
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/* |
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* Override strerror() to get consistent output across platforms. |
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*/ |
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static struct |
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{ |
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int errno_value; |
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const char *errno_str; |
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} errno_list[] = { |
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/* clang-format off */ |
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#define STRINGIFY(x) #x |
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#define ENTRY(x) {x, &STRINGIFY(undef_ ## x)[6]} |
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ENTRY(EPERM), |
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ENTRY(ENOENT), |
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ENTRY(ESRCH), |
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ENTRY(EINTR), |
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ENTRY(EIO), |
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ENTRY(ENXIO), |
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ENTRY(E2BIG), |
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#ifdef ENOEXEC |
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ENTRY(ENOEXEC), |
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#endif |
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ENTRY(EBADF), |
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ENTRY(ECHILD), |
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ENTRY(EDEADLK), |
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ENTRY(ENOMEM), |
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ENTRY(EACCES), |
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ENTRY(EFAULT), |
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#ifdef ENOTBLK |
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ENTRY(ENOTBLK), |
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#endif |
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ENTRY(EBUSY), |
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ENTRY(EEXIST), |
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ENTRY(EXDEV), |
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ENTRY(ENODEV), |
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ENTRY(ENOTDIR), |
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ENTRY(EISDIR), |
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ENTRY(EINVAL), |
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ENTRY(ENFILE), |
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ENTRY(EMFILE), |
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ENTRY(ENOTTY), |
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#ifdef ETXTBSY |
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ENTRY(ETXTBSY), |
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#endif |
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ENTRY(EFBIG), |
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ENTRY(ENOSPC), |
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ENTRY(ESPIPE), |
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ENTRY(EROFS), |
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ENTRY(EMLINK), |
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ENTRY(EPIPE), |
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ENTRY(EDOM), |
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ENTRY(ERANGE), |
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ENTRY(EAGAIN), |
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{ 0, (char *)0 } |
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}; |
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/* clang-format on */ |
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// Enabled during tests |
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static int _json_c_strerror_enable = 0; |
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extern char *getenv(const char *name); // Avoid including stdlib.h |
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#define PREFIX "ERRNO=" |
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static char errno_buf[128] = PREFIX; |
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char *_json_c_strerror(int errno_in) |
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{ |
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int start_idx; |
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char digbuf[20]; |
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int ii, jj; |
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if (!_json_c_strerror_enable) |
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_json_c_strerror_enable = (getenv("_JSON_C_STRERROR_ENABLE") == NULL) ? -1 : 1; |
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if (_json_c_strerror_enable == -1) |
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return strerror(errno_in); |
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// Avoid standard functions, so we don't need to include any |
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// headers, or guess at signatures. |
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for (ii = 0; errno_list[ii].errno_str != (char *)0; ii++) |
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{ |
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const char *errno_str = errno_list[ii].errno_str; |
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if (errno_list[ii].errno_value != errno_in) |
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continue; |
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for (start_idx = sizeof(PREFIX) - 1, jj = 0; errno_str[jj] != '\0'; |
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jj++, start_idx++) |
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{ |
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errno_buf[start_idx] = errno_str[jj]; |
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} |
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errno_buf[start_idx] = '\0'; |
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return errno_buf; |
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} |
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// It's not one of the known errno values, return the numeric value. |
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for (ii = 0; errno_in >= 10; errno_in /= 10, ii++) |
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{ |
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digbuf[ii] = "0123456789"[(errno_in % 10)]; |
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} |
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digbuf[ii] = "0123456789"[(errno_in % 10)]; |
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// Reverse the digits |
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for (start_idx = sizeof(PREFIX) - 1; ii >= 0; ii--, start_idx++) |
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{ |
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errno_buf[start_idx] = digbuf[ii]; |
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} |
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errno_buf[start_idx] = '\0'; |
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return errno_buf; |
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} |
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