diff options
Diffstat (limited to 'libgpg-error-1.9/src/strerror.c')
| -rw-r--r-- | libgpg-error-1.9/src/strerror.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/libgpg-error-1.9/src/strerror.c b/libgpg-error-1.9/src/strerror.c new file mode 100644 index 0000000..dc56040 --- /dev/null +++ b/libgpg-error-1.9/src/strerror.c @@ -0,0 +1,169 @@ +/* strerror.c - Describing an error code. + Copyright (C) 2003 g10 Code GmbH + + This file is part of libgpg-error. + + libgpg-error is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License + as published by the Free Software Foundation; either version 2.1 of + the License, or (at your option) any later version. + + libgpg-error is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with libgpg-error; if not, write to the Free + Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +#if HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> + +#include <gpg-error.h> + +#include "gettext.h" +#include "err-codes.h" + +/* Return a pointer to a string containing a description of the error + code in the error value ERR. This function is not thread-safe. */ +const char * +gpg_strerror (gpg_error_t err) +{ + gpg_err_code_t code = gpg_err_code (err); + + if (code & GPG_ERR_SYSTEM_ERROR) + { + int no = gpg_err_code_to_errno (code); + if (no) + return strerror (no); + else + code = GPG_ERR_UNKNOWN_ERRNO; + } + return dgettext (PACKAGE, msgstr + msgidx[msgidxof (code)]); +} + + +#ifdef HAVE_STRERROR_R +#ifdef STRERROR_R_CHAR_P +/* The GNU C library and probably some other systems have this weird + variant of strerror_r. */ + +/* Return a dynamically allocated string in *STR describing the system + error NO. If this call succeeds, return 1. If this call fails due + to a resource shortage, set *STR to NULL and return 1. If this + call fails because the error number is not valid, don't set *STR + and return 0. */ +static int +system_strerror_r (int no, char *buf, size_t buflen) +{ + char *errstr; + + errstr = strerror_r (no, buf, buflen); + if (errstr != buf) + { + size_t errstr_len = strlen (errstr) + 1; + size_t cpy_len = errstr_len < buflen ? errstr_len : buflen; + memcpy (buf, errstr, cpy_len); + + return cpy_len == errstr_len ? 0 : ERANGE; + } + else + { + /* We can not tell if the buffer was large enough, but we can + try to make a guess. */ + if (strlen (buf) + 1 >= buflen) + return ERANGE; + + return 0; + } +} + +#else /* STRERROR_R_CHAR_P */ +/* Now the POSIX version. */ + +static int +system_strerror_r (int no, char *buf, size_t buflen) +{ + return strerror_r (no, buf, buflen); +} + +#endif /* STRERROR_R_CHAR_P */ + +#else /* HAVE_STRERROR_H */ +/* Without strerror_r(), we can still provide a non-thread-safe + version. Maybe we are even lucky and the system's strerror() is + already thread-safe. */ + +static int +system_strerror_r (int no, char *buf, size_t buflen) +{ + char *errstr = strerror (no); + + if (!errstr) + { + int saved_errno = errno; + + if (saved_errno != EINVAL) + snprintf (buf, buflen, "strerror failed: %i\n", errno); + return saved_errno; + } + else + { + size_t errstr_len = strlen (errstr) + 1; + size_t cpy_len = errstr_len < buflen ? errstr_len : buflen; + memcpy (buf, errstr, cpy_len); + return cpy_len == errstr_len ? 0 : ERANGE; + } +} +#endif + + +/* Return the error string for ERR in the user-supplied buffer BUF of + size BUFLEN. This function is, in contrast to gpg_strerror, + thread-safe if a thread-safe strerror_r() function is provided by + the system. If the function succeeds, 0 is returned and BUF + contains the string describing the error. If the buffer was not + large enough, ERANGE is returned and BUF contains as much of the + beginning of the error string as fits into the buffer. */ +int +gpg_strerror_r (gpg_error_t err, char *buf, size_t buflen) +{ + gpg_err_code_t code = gpg_err_code (err); + const char *errstr; + size_t errstr_len; + size_t cpy_len; + + if (code & GPG_ERR_SYSTEM_ERROR) + { + int no = gpg_err_code_to_errno (code); + if (no) + { + int system_err = system_strerror_r (no, buf, buflen); + + if (system_err != EINVAL) + { + if (buflen) + buf[buflen - 1] = '\0'; + return system_err; + } + } + code = GPG_ERR_UNKNOWN_ERRNO; + } + + errstr = dgettext (PACKAGE, msgstr + msgidx[msgidxof (code)]); + errstr_len = strlen (errstr) + 1; + cpy_len = errstr_len < buflen ? errstr_len : buflen; + memcpy (buf, errstr, cpy_len); + if (buflen) + buf[buflen - 1] = '\0'; + + return cpy_len == errstr_len ? 0 : ERANGE; +} |