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jaypeche/06LST02.C

Created December 4, 2014 00:31
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getopt examples Linux
Raw
06LST02.C
#include <stdio.h>
#include <getopt.h>
int
main(int argc,char **argv) {
int optch;
static char optstring[] = "gW:c";
while ( (optch = getopt(argc,argv,optstring)) != -1 )
switch ( optch ) {
case 'c' :
puts("-c processed.");
break;
case 'g' :
puts("-g processed.");
break;
case 'W' :
printf("-W '%s' processed.\n",optarg);
break;
default :
puts("Unknown option!");
}
for ( ; optind < argc; ++optind )
printf("argv[%d] = '%s'\n",
optind, argv[optind]);
return 0;
}
Raw
06LST03.C
/* dos_cvrt.c */
static const char rcsid[] =
"$Id: dos_cvrt.c,v 1.9 1998/12/04 03:07:13 student1 Exp $";
/* REVISION HISTORY:
* $Log: dos_cvrt.c,v $
* Revision 1.9 1998/12/04 03:07:13 student1
* Added command line processing.
*
* Revision 1.8 1998/11/27 02:29:54 student1
* Separated out the text conversion
* functions to make this project
* more modular.
*
* Revision 1.7 1998/11/27 01:31:39 student1
* Now handles multiple input files, plus
* put basename code into its own Basename() 
* function.
*
* Revision 1.6 1998/11/27 01:01:28 student1
* Separated conversions into unix2dos() and
* dos2unix() functions.
*
* Revision 1.5 1998/11/23 05:32:21 student1
* Completed utility & tested ok.
*
* Revision 1.4 1998/11/23 05:04:23 student1
* Coded basename test
*
* Revision 1.3 1998/11/21 22:49:39 student1
* Demonstration of RCS substitutions
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <getopt.h>
#include "dos_cvrt.h"
extern char *optarg; /* Option argument */
extern int optind; /* Option/arg index */
extern int opterr; /* Error handling flg */
/*
* Show brief command usage help:
*/
static void
usage(const char *cmd) {
fprintf(stderr,"Usage: %s [-h] [-u] infile..\n",cmd);
fputs("\t-h\t\tGives this help display.\n",stderr);
fputs("\t-u\t\tSpecifies UNIX to DOS conversion.\n\n",stderr);
fputs("Command unix_cvrt converts UNIX to DOS text.\n",stderr);
fputs("while dos_cvrt converts DOS to UNIX, except "
"when -u is used.\n\n",stderr);
}
/*
* Return the pointer to the basename component
* of a pathname:
*/
static char *
Basename(const char *path) {
char *base_name = 0;
if ( ( base_name = strrchr(path,'/') ) != 0 )
++base_name; /* Skip over '/' */
else
base_name = (char *) path; /* No dir. */
return base_name;
}
int
main(int argc,char **argv) {
char *base_name = 0; /* Basename of command */
int rc = 0; /* Command return code */
int (*conv)(const char *pathname); /* Conv. Func. Ptr */
int x;
int cmdopt_u = 0; /* -u ; True if UNIX -> DOS */
int optch; /* Current option character */
static char stropts[] = "hu"; /* Supported options */
/*
* Determine the basename of the command name. This
* is necessary since this command could be invoked
* with a pathname. For example, argv[0] could be
* "/usr/local/bin/unix_cvrt" if it was installed
* in the system that way.
*/
base_name = Basename(argv[0]);
if ( !strcmp(base_name,"unix_cvrt") )
cmdopt_u = 1; /* Pretend that -u was given */
/*
* Process all command line options :
*/
while ( (optch = getopt(argc,argv,stropts)) != EOF )
switch ( optch ) {
case 'h' : /* -h ; Request usage help */
usage(base_name);
return 0;
case 'u' : /* -u ; Specifies UNIX -> DOS */
cmdopt_u = 1;
break;
default : /* Unsupported option */
fputs("Use -h for help.\n",stderr);
return 1;
}
/*
* Check for missing input file:
*/
if ( argc - optind < 1 ) {
fprintf(stderr,"Missing input file(s).\n");
fputs("Use -h for help.\n",stderr);
return 1;
}
/*
* -u determines the direction of conversion :
*/
if ( cmdopt_u != 0 )
conv = unix2dos;
else
conv = dos2unix;
/*
* Perform a text conversion
*/
for ( x=optind; x<argc; ++x )
if ( (rc = conv(argv[x])) != 0 )
break; /* An error occured */
return rc;
}
Raw
06LST05.C
/* dos_cvrt.c */
static const char rcsid[] =
"$Id: dos_cvrt.c,v 1.10 1998/12/04 04:43:10 student1 Exp $";
/* REVISION HISTORY:
* $Log: dos_cvrt.c,v $
* Revision 1.10 1998/12/04 04:43:10 student1
* Added GNU long options.
*
* Revision 1.9 1998/12/04 03:07:13 student1
* Added command line processing.
*
* Revision 1.8 1998/11/27 02:29:54 student1
* Separated out the text conversion
* functions to make this project
* more modular.
*
* Revision 1.7 1998/11/27 01:31:39 student1
* Now handles multiple input files, plus
* put basename code into its own Basename() 
* function.
*
* Revision 1.6 1998/11/27 01:01:28 student1
* Separated conversions into unix2dos() and
* dos2unix() functions.
*
* Revision 1.5 1998/11/23 05:32:21 student1
* Completed utility & tested ok.
*
* Revision 1.4 1998/11/23 05:04:23 student1
* Coded basename test
*
* Revision 1.3 1998/11/21 22:49:39 student1
* Demonstration of RCS substitutions
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <getopt.h>
#include "dos_cvrt.h"
extern char *optarg; /* Option argument */
extern int optind; /* Option/arg index */
extern int opterr; /* Error handling flg */
/*
* Show brief command usage help:
*/
static void
usage(const char *cmd) {
fprintf(stderr,"Usage: %s [-h | --help] [--version] "
"[-u] infile..\n",cmd);
fputs("\t-h (or --help)\tGives this help display.\n",stderr);
fputs("\t--version\tDisplays program version.\n",stderr);
fputs("\t-u\t\tSpecifies UNIX to DOS conversion.\n\n",stderr);
fputs("Command unix_cvrt converts UNIX to DOS text.\n",stderr);
fputs("while dos_cvrt converts DOS to UNIX, except "
"when -u is used.\n\n",stderr);
}
/*
* Return the pointer to the basename component
* of a pathname:
*/
static char *
Basename(const char *path) {
char *base_name = 0;
if ( ( base_name = strrchr(path,'/') ) != 0 )
++base_name; /* Skip over '/' */
else
base_name = (char *) path; /* No dir. */
return base_name;
}
int
main(int argc,char **argv) {
char *base_name = 0; /* Basename of command */
int rc = 0; /* Command return code */
int (*conv)(const char *pathname); /* Conv. Func. Ptr */
int x;
int cmdopt_u = 0; /* -u ; True if UNIX -> DOS */
static int cmdopt_v = 0;/* --version */
int cmdx = 0; /* lopts[] index */
int optch; /* Current option character */
static char stropts[] = "hu"; /* Supported options */
static struct option lopts[] = {
{ "help", 0, 0, 'h' }, /* --help */
{ "version", 0, &cmdopt_v, 1 }, /* --version */
{ 0, 0, 0, 0 } /* No more options */
};
/*
* Determine the basename of the command name. This
* is necessary since this command could be invoked
* with a pathname. For example, argv[0] could be
* "/usr/local/bin/unix_cvrt" if it was installed
* in the system that way.
*/
base_name = Basename(argv[0]);
if ( !strcmp(base_name,"unix_cvrt") )
cmdopt_u = 1; /* Pretend that -u was given */
/*
* Process all command line options :
*/
while ( (optch = getopt_long(argc,argv,stropts,
lopts,&cmdx)) != EOF )
switch ( optch ) {
case 0 : /* Processed lopts[cmdx] */
break;
case 'h' : /* -h or --help */
usage(base_name);
return 0;
case 'u' : /* -u ; Specifies UNIX -> DOS */
cmdopt_u = 1;
break;
default : /* Unsupported option */
fputs("Use --help for help.\n",stderr);
return 1;
}
if ( cmdopt_v != 0 ) {
fprintf(stderr,"Version 1.0\n");
return 0;
}
/*
* Check for missing input file:
*/
if ( argc - optind < 1 ) {
fprintf(stderr,"Missing input file(s).\n");
fputs("Use --help for help.\n",stderr);
return 1;
}
/*
* -u determines the direction of conversion :
*/
if ( cmdopt_u != 0 )
conv = unix2dos;
else
conv = dos2unix;
/*
* Perform a text conversion
*/
for ( x=optind; x<argc; ++x )
if ( (rc = conv(argv[x])) != 0 )
break; /* An error occured */
return rc;
}
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