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/******************************************************************************
pamexec
*******************************************************************************
Split a Netpbm format input file into multiple Netpbm format output streams
with one image per output stream and pipe this into the specified command.
By Bryan Henderson, Olympia WA; June 2000
and Michael Pot, New Zealand, August 2011
Contributed to the public domain by its authors.
******************************************************************************/
#define _BSD_SOURCE 1 /* Make sure strdup() is in string.h */
#define _XOPEN_SOURCE 500 /* Make sure strdup() is in string.h */
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include "pm_c_util.h"
#include "shhopt.h"
#include "nstring.h"
#include "mallocvar.h"
#include "pam.h"
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * command;
const char * inputFileName;
unsigned int debug;
unsigned int check;
};
static void
parseCommandLine(int argc, const char ** argv,
struct cmdlineInfo * const cmdlineP) {
/*----------------------------------------------------------------------------
Note that the pointers we place into *cmdlineP are sometimes to storage
in the argv array.
-----------------------------------------------------------------------------*/
optEntry *option_def;
/* Instructions to OptParseOptions3 on how to parse our options.
*/
optStruct3 opt;
unsigned int option_def_index;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENT3 */
OPTENT3(0, "debug", OPT_FLAG, NULL, &cmdlineP->debug, 0);
OPTENT3(0, "check", OPT_FLAG, NULL, &cmdlineP->check, 0);
opt.opt_table = option_def;
opt.short_allowed = FALSE; /* We have no short (old-fashioned) options */
opt.allowNegNum = FALSE; /* We have no parms that are negative numbers */
pm_optParseOptions3(&argc, (char **)argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and some of *cmdlineP and others. */
if (argc-1 < 1)
pm_error("You must specify at least one argument: the shell command "
"to execute");
else {
cmdlineP->command = argv[1];
if (argc-1 < 2)
cmdlineP->inputFileName = "-";
else {
cmdlineP->inputFileName = argv[2];
if (argc-1 > 2)
pm_error("Too many arguments. There are at most two: "
"command and input file name");
}
}
}
static void
pipeOneImage(FILE * const infileP,
FILE * const outfileP) {
struct pam inpam;
struct pam outpam;
enum pm_check_code checkRetval;
unsigned int row;
tuple * tuplerow;
pnm_readpaminit(infileP, &inpam, PAM_STRUCT_SIZE(tuple_type));
pnm_checkpam(&inpam, PM_CHECK_BASIC, &checkRetval);
outpam = inpam;
outpam.file = outfileP;
pnm_writepaminit(&outpam);
tuplerow = pnm_allocpamrow(&inpam);
for (row = 0; row < inpam.height; ++row) {
pnm_readpamrow(&inpam, tuplerow);
pnm_writepamrow(&outpam, tuplerow);
}
pnm_freepamrow(tuplerow);
}
static void
doOneImage(FILE * const ifP,
const char * const command,
bool const check,
const char ** const errorP) {
/*----------------------------------------------------------------------------
Run command 'command' on the next image in stream *ifP.
Return as *errorP a text explanation of how we failed, or NULL if we
didn't.
-----------------------------------------------------------------------------*/
FILE * ofP;
ofP = popen(command, "w");
if (ofP == NULL)
pm_asprintf(errorP,
"Failed to start shell to run command '%s'. "
"errno = %d (%s)",
command, errno, strerror(errno));
else {
int rc;
pipeOneImage(ifP, ofP);
rc = pclose(ofP);
if (check && rc != 0)
pm_asprintf(errorP, "Command '%s' terminated abnormally "
"or with nonzero exit status", command);
else
*errorP = NULL;
}
}
int
main(int argc, const char *argv[]) {
struct cmdlineInfo cmdline;
FILE * ifP; /* Input file pointer */
int eof; /* No more images in input */
unsigned int imageSeq;
/* Sequence number of current image in input file. First = 0.
(Useful for tracking down problems).
*/
pm_proginit(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFileName);
for (eof = FALSE, imageSeq = 0; !eof; ++imageSeq) {
const char * error;
doOneImage(ifP, cmdline.command, cmdline.check, &error);
if (error) {
pm_error("Failed on image %u: %s", imageSeq, error);
pm_strfree(error);
}
pnm_nextimage(ifP, &eof);
}
pm_close(ifP);
return 0;
}
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