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/**
* \file pgusage.c
*
* Automated Options Paged Usage module.
*
* @addtogroup autoopts
* @{
*/
/*
* This routine will run run-on options through a pager so the
* user may examine, print or edit them at their leisure.
*
* 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
*/
#if defined(HAVE_WORKING_FORK)
static inline FILE *
open_tmp_usage(char ** buf)
{
char * bf;
size_t bfsz;
{
unsigned int my_pid = (unsigned int)getpid();
char const * tmpdir = getenv(TMPDIR);
if (tmpdir == NULL)
tmpdir = tmp_dir;
bfsz = TMP_FILE_FMT_LEN + strlen(tmpdir) + 10;
bf = AGALOC(bfsz, "tmp fil");
snprintf(bf, bfsz, TMP_FILE_FMT, tmpdir, my_pid);
}
{
static mode_t const cmask = S_IRWXO | S_IRWXG;
mode_t svmsk = umask(cmask);
int fd = mkstemp(bf);
(void)umask(svmsk);
if (fd < 0) {
AGFREE(bf);
return NULL;
}
*buf = bf;
return fdopen(fd, "w");
}
}
static inline char *
mk_pager_cmd(char const * fname)
{
/*
* Page the file and remove it when done. For shell script processing,
* we must redirect the output to the current stderr, otherwise stdout.
*/
fclose(option_usage_fp);
option_usage_fp = NULL;
{
char const * pager = (char const *)getenv(PAGER_NAME);
size_t bfsz;
char * res;
/*
* Use the "more(1)" program if "PAGER" has not been defined
*/
if (pager == NULL)
pager = MORE_STR;
bfsz = 2 * strlen(fname) + strlen(pager) + PAGE_USAGE_FMT_LEN;
res = AGALOC(bfsz, "more cmd");
snprintf(res, bfsz, PAGE_USAGE_FMT, pager, fname);
AGFREE(fname);
return res;
}
}
#endif
/*=export_func optionPagedUsage
* private:
*
* what: emit help text and pass through a pager program.
* arg: + tOptions * + opts + program options descriptor +
* arg: + tOptDesc * + od + the descriptor for this arg +
*
* doc:
* Run the usage output through a pager.
* This is very handy if it is very long.
* This is disabled on platforms without a working fork() function.
=*/
void
optionPagedUsage(tOptions * opts, tOptDesc * od)
{
#if ! defined(HAVE_WORKING_FORK)
if ((od->fOptState & OPTST_RESET) != 0)
return;
(*opts->pUsageProc)(opts, EXIT_SUCCESS);
#else
static bool sv_print_exit = false;
static char * fil_name = NULL;
/*
* IF we are being called after the usage proc is done
* (and thus has called "exit(2)")
* THEN invoke the pager to page through the usage file we created.
*/
switch (pagerState) {
case PAGER_STATE_INITIAL:
{
if ((od->fOptState & OPTST_RESET) != 0)
return;
option_usage_fp = open_tmp_usage(&fil_name);
if (option_usage_fp == NULL)
(*opts->pUsageProc)(opts, EXIT_SUCCESS);
pagerState = PAGER_STATE_READY;
sv_print_exit = print_exit;
/*
* Set up so this routine gets called during the exit logic
*/
atexit((void(*)(void))optionPagedUsage);
/*
* The usage procedure will now put the usage information into
* the temporary file we created above. Keep any shell commands
* out of the result.
*/
print_exit = false;
(*opts->pUsageProc)(opts, EXIT_SUCCESS);
/* NOTREACHED */
_exit(EXIT_FAILURE);
}
case PAGER_STATE_READY:
fil_name = mk_pager_cmd(fil_name);
if (sv_print_exit) {
fputs("\nexit 0\n", stdout);
fclose(stdout);
dup2(STDERR_FILENO, STDOUT_FILENO);
} else {
fclose(stderr);
dup2(STDOUT_FILENO, STDERR_FILENO);
}
ignore_val( system( fil_name));
AGFREE(fil_name);
case PAGER_STATE_CHILD:
/*
* This is a child process used in creating shell script usage.
*/
break;
}
#endif
}
/** @}
*
* Local Variables:
* mode: C
* c-file-style: "stroustrup"
* indent-tabs-mode: nil
* End:
* end of autoopts/pgusage.c */
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