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/**
* \file file.c
*
* Handle options that have file names for arguments.
*
* @addtogroup autoopts
* @{
*/
/*
* This file is part of AutoOpts, a companion to AutoGen.
* AutoOpts is free software.
* AutoOpts is Copyright (C) 1992-2015 by Bruce Korb - all rights reserved
*
* AutoOpts is available under any one of two licenses. The license
* in use must be one of these two and the choice is under the control
* of the user of the license.
*
* The GNU Lesser General Public License, version 3 or later
* See the files "COPYING.lgplv3" and "COPYING.gplv3"
*
* The Modified Berkeley Software Distribution License
* See the file "COPYING.mbsd"
*
* These files have the following sha256 sums:
*
* 8584710e9b04216a394078dc156b781d0b47e1729104d666658aecef8ee32e95 COPYING.gplv3
* 4379e7444a0e2ce2b12dd6f5a52a27a4d02d39d247901d3285c88cf0d37f477b COPYING.lgplv3
* 13aa749a5b0a454917a944ed8fffc530b784f5ead522b1aacaf4ec8aa55a6239 COPYING.mbsd
*/
/**
* Make sure the directory containing the subject file exists and that
* the file exists or does not exist, per the option requirements.
*
* @param ftype file existence type flags
* @param pOpts program option descriptor
* @param pOD the option descriptor
*/
static void
check_existence(teOptFileType ftype, tOptions * pOpts, tOptDesc * pOD)
{
char const * fname = pOD->optArg.argString;
struct stat sb;
errno = 0;
switch (ftype & FTYPE_MODE_EXIST_MASK) {
case FTYPE_MODE_MUST_NOT_EXIST:
if ((stat(fname, &sb) == 0) || (errno != ENOENT)) {
if (errno == 0)
errno = EINVAL;
fserr_exit(pOpts->pzProgName, "stat", fname);
/* NOTREACHED */
}
/* FALLTHROUGH */
default:
case FTYPE_MODE_MAY_EXIST:
{
char * p = strrchr(fname, DIRCH);
size_t l;
if (p == NULL)
/*
* The file may or may not exist and its directory is ".".
* Assume that "." exists.
*/
break;
l = (size_t)(p - fname);
p = AGALOC(l + 1, "fname");
memcpy(p, fname, l);
p[l] = NUL;
if ((stat(p, &sb) != 0) || (errno = EINVAL, ! S_ISDIR(sb.st_mode)))
fserr_exit(pOpts->pzProgName, "stat", p);
/* NOTREACHED */
AGFREE(p);
break;
}
case FTYPE_MODE_MUST_EXIST:
if ( (stat(fname, &sb) != 0)
|| (errno = EINVAL, ! S_ISREG(sb.st_mode)) )
fserr_exit(pOpts->pzProgName, "stat", fname);
/* NOTREACHED */
break;
}
}
/**
* Open the specified file with open(2) and save the FD.
*
* @param pOpts program option descriptor
* @param pOD the option descriptor
* @param mode the open mode (uses int flags value)
*/
static void
open_file_fd(tOptions * pOpts, tOptDesc * pOD, tuFileMode mode)
{
int fd = open(pOD->optArg.argString, mode.file_flags);
if (fd < 0)
fserr_exit(pOpts->pzProgName, "open", pOD->optArg.argString);
/* NOTREACHED */
if ((pOD->fOptState & OPTST_ALLOC_ARG) != 0)
pOD->optCookie = VOIDP(pOD->optArg.argString);
else
AGDUPSTR(pOD->optCookie, pOD->optArg.argString, "file name");
pOD->optArg.argFd = fd;
pOD->fOptState &= ~OPTST_ALLOC_ARG;
}
/**
* Open the specified file with open(2) and save the FD.
*
* @param pOpts program option descriptor
* @param pOD the option descriptor
* @param mode the open mode (uses "char *" mode value)
*/
static void
fopen_file_fp(tOptions * pOpts, tOptDesc * pOD, tuFileMode mode)
{
FILE * fp = fopen(pOD->optArg.argString, mode.file_mode);
if (fp == NULL)
fserr_exit(pOpts->pzProgName, "fopen", pOD->optArg.argString);
/* NOTREACHED */
if ((pOD->fOptState & OPTST_ALLOC_ARG) != 0)
pOD->optCookie = VOIDP(pOD->optArg.argString);
else
AGDUPSTR(pOD->optCookie, pOD->optArg.argString, "file name");
pOD->optArg.argFp = fp;
pOD->fOptState &= ~OPTST_ALLOC_ARG;
}
/*=export_func optionFileCheck
* private:
*
* what: Decipher a boolean value
* arg: + tOptions * + pOpts + program options descriptor +
* arg: + tOptDesc * + pOptDesc + the descriptor for this arg +
* arg: + teOptFileType + ftype + File handling type +
* arg: + tuFileMode + mode + file open mode (if needed) +
*
* doc:
* Make sure the named file conforms with the file type mode.
* The mode specifies if the file must exist, must not exist or may
* (or may not) exist. The mode may also specify opening the
* file: don't, open just the descriptor (fd), or open as a stream
* (FILE * pointer).
=*/
void
optionFileCheck(tOptions * pOpts, tOptDesc * pOD,
teOptFileType ftype, tuFileMode mode)
{
if (pOpts <= OPTPROC_EMIT_LIMIT) {
if (pOpts != OPTPROC_EMIT_USAGE)
return;
switch (ftype & FTYPE_MODE_EXIST_MASK) {
case FTYPE_MODE_MUST_NOT_EXIST:
fputs(zFileCannotExist + tab_skip_ct, option_usage_fp);
break;
case FTYPE_MODE_MUST_EXIST:
fputs(zFileMustExist + tab_skip_ct, option_usage_fp);
break;
}
return;
}
if ((pOD->fOptState & OPTST_RESET) != 0) {
if (pOD->optCookie != NULL)
AGFREE(pOD->optCookie);
return;
}
check_existence(ftype, pOpts, pOD);
switch (ftype & FTYPE_MODE_OPEN_MASK) {
default:
case FTYPE_MODE_NO_OPEN: break;
case FTYPE_MODE_OPEN_FD: open_file_fd( pOpts, pOD, mode); break;
case FTYPE_MODE_FOPEN_FP: fopen_file_fp(pOpts, pOD, mode); break;
}
}
/** @}
*
* Local Variables:
* mode: C
* c-file-style: "stroustrup"
* indent-tabs-mode: nil
* End:
* end of autoopts/file.c */
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