mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-10-31 19:46:16 +01:00
180 lines
8.3 KiB
C
180 lines
8.3 KiB
C
|
#ifdef WIN32
|
||
|
|
/*****************************************************************************
|
||
|
|
*
|
||
|
|
* MODULE NAME : GETOPT.C
|
||
|
|
*
|
||
|
|
* COPYRIGHTS:
|
||
|
|
* This module contains code made available by IBM
|
||
|
|
* Corporation on an AS IS basis. Any one receiving the
|
||
|
|
* module is considered to be licensed under IBM copyrights
|
||
|
|
* to use the IBM-provided source code in any way he or she
|
||
|
|
* deems fit, including copying it, compiling it, modifying
|
||
|
|
* it, and redistributing it, with or without
|
||
|
|
* modifications. No license under any IBM patents or
|
||
|
|
* patent applications is to be implied from this copyright
|
||
|
|
* license.
|
||
|
|
*
|
||
|
|
* A user of the module should understand that IBM cannot
|
||
|
|
* provide technical support for the module and will not be
|
||
|
|
* responsible for any consequences of use of the program.
|
||
|
|
*
|
||
|
|
* Any notices, including this one, are not to be removed
|
||
|
|
* from the module without the prior written consent of
|
||
|
|
* IBM.
|
||
|
|
*
|
||
|
|
* AUTHOR: Original author:
|
||
|
|
* G. R. Blair (BOBBLAIR at AUSVM1)
|
||
|
|
* Internet: bobblair@bobblair.austin.ibm.com
|
||
|
|
*
|
||
|
|
* Extensively revised by:
|
||
|
|
* John Q. Walker II, Ph.D. (JOHHQ at RALVM6)
|
||
|
|
* Internet: johnq@ralvm6.vnet.ibm.com
|
||
|
|
*
|
||
|
|
*****************************************************************************/
|
||
|
|
|
||
|
|
/******************************************************************************
|
||
|
|
* getopt()
|
||
|
|
*
|
||
|
|
* The getopt() function is a command line parser. It returns the next
|
||
|
|
* option character in argv that matches an option character in opstring.
|
||
|
|
*
|
||
|
|
* The argv argument points to an array of argc+1 elements containing argc
|
||
|
|
* pointers to character strings followed by a null pointer.
|
||
|
|
*
|
||
|
|
* The opstring argument points to a string of option characters; if an
|
||
|
|
* option character is followed by a colon, the option is expected to have
|
||
|
|
* an argument that may or may not be separated from it by white space.
|
||
|
|
* The external variable optarg is set to point to the start of the option
|
||
|
|
* argument on return from getopt().
|
||
|
|
*
|
||
|
|
* The getopt() function places in optind the argv index of the next argument
|
||
|
|
* to be processed. The system initializes the external variable optind to
|
||
|
|
* 1 before the first call to getopt().
|
||
|
|
*
|
||
|
|
* When all options have been processed (that is, up to the first nonoption
|
||
|
|
* argument), getopt() returns EOF. The special option "--" may be used to
|
||
|
|
* delimit the end of the options; EOF will be returned, and "--" will be
|
||
|
|
* skipped.
|
||
|
|
*
|
||
|
|
* The getopt() function returns a question mark (?) when it encounters an
|
||
|
|
* option character not included in opstring. This error message can be
|
||
|
|
* disabled by setting opterr to zero. Otherwise, it returns the option
|
||
|
|
* character that was detected.
|
||
|
|
*
|
||
|
|
* If the special option "--" is detected, or all options have been
|
||
|
|
* processed, EOF is returned.
|
||
|
|
*
|
||
|
|
* Options are marked by either a minus sign (-) or a slash (/).
|
||
|
|
*
|
||
|
|
* No errors are defined.
|
||
|
|
*****************************************************************************/
|
||
|
|
|
||
|
|
#include <stdio.h> /* for EOF */
|
||
|
|
#include <string.h> /* for strchr() */
|
||
|
|
|
||
|
|
/* static (global) variables that are specified as exported by getopt() */
|
||
|
|
extern char *optarg; /* pointer to the start of the option argument */
|
||
|
|
extern int optind; /* number of the next argv[] to be evaluated */
|
||
|
|
extern int opterr; /* non-zero if a question mark should be returned
|
||
|
|
when a non-valid option character is detected */
|
||
|
|
|
||
|
|
/* handle possible future character set concerns by putting this in a macro */
|
||
|
|
#define _next_char(string) (char)(*(string+1))
|
||
|
|
|
||
|
|
int getopt(int argc, char *argv[], char *opstring)
|
||
|
|
{
|
||
|
|
static char *pIndexPosition = NULL; /* place inside current argv string */
|
||
|
|
char *pArgString = NULL; /* where to start from next */
|
||
|
|
char *pOptString; /* the string in our program */
|
||
|
|
|
||
|
|
|
||
|
|
if (pIndexPosition != NULL) {
|
||
|
|
/* we last left off inside an argv string */
|
||
|
|
if (*(++pIndexPosition)) {
|
||
|
|
/* there is more to come in the most recent argv */
|
||
|
|
pArgString = pIndexPosition;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pArgString == NULL) {
|
||
|
|
/* we didn't leave off in the middle of an argv string */
|
||
|
|
if (optind >= argc) {
|
||
|
|
/* more command-line arguments than the argument count */
|
||
|
|
pIndexPosition = NULL; /* not in the middle of anything */
|
||
|
|
return EOF; /* used up all command-line arguments */
|
||
|
|
}
|
||
|
|
|
||
|
|
/*---------------------------------------------------------------------
|
||
|
|
* If the next argv[] is not an option, there can be no more options.
|
||
|
|
*-------------------------------------------------------------------*/
|
||
|
|
pArgString = argv[optind++]; /* set this to the next argument ptr */
|
||
|
|
|
||
|
|
if (('/' != *pArgString) && /* doesn't start with a slash or a dash? */
|
||
|
|
('-' != *pArgString)) {
|
||
|
|
--optind; /* point to current arg once we're done */
|
||
|
|
optarg = NULL; /* no argument follows the option */
|
||
|
|
pIndexPosition = NULL; /* not in the middle of anything */
|
||
|
|
return EOF; /* used up all the command-line flags */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* check for special end-of-flags markers */
|
||
|
|
if ((strcmp(pArgString, "-") == 0) ||
|
||
|
|
(strcmp(pArgString, "--") == 0)) {
|
||
|
|
optarg = NULL; /* no argument follows the option */
|
||
|
|
pIndexPosition = NULL; /* not in the middle of anything */
|
||
|
|
return EOF; /* encountered the special flag */
|
||
|
|
}
|
||
|
|
|
||
|
|
pArgString++; /* look past the / or - */
|
||
|
|
}
|
||
|
|
|
||
|
|
if (':' == *pArgString) { /* is it a colon? */
|
||
|
|
/*---------------------------------------------------------------------
|
||
|
|
* Rare case: if opterr is non-zero, return a question mark;
|
||
|
|
* otherwise, just return the colon we're on.
|
||
|
|
*-------------------------------------------------------------------*/
|
||
|
|
return (opterr ? (int)'?' : (int)':');
|
||
|
|
}
|
||
|
|
else if ((pOptString = strchr(opstring, *pArgString)) == 0) {
|
||
|
|
/*---------------------------------------------------------------------
|
||
|
|
* The letter on the command-line wasn't any good.
|
||
|
|
*-------------------------------------------------------------------*/
|
||
|
|
optarg = NULL; /* no argument follows the option */
|
||
|
|
pIndexPosition = NULL; /* not in the middle of anything */
|
||
|
|
return (opterr ? (int)'?' : (int)*pArgString);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
/*---------------------------------------------------------------------
|
||
|
|
* The letter on the command-line matches one we expect to see
|
||
|
|
*-------------------------------------------------------------------*/
|
||
|
|
if (':' == _next_char(pOptString)) { /* is the next letter a colon? */
|
||
|
|
/* It is a colon. Look for an argument string. */
|
||
|
|
if ('\0' != _next_char(pArgString)) { /* argument in this argv? */
|
||
|
|
optarg = &pArgString[1]; /* Yes, it is */
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
/*-------------------------------------------------------------
|
||
|
|
* The argument string must be in the next argv.
|
||
|
|
* But, what if there is none (bad input from the user)?
|
||
|
|
* In that case, return the letter, and optarg as NULL.
|
||
|
|
*-----------------------------------------------------------*/
|
||
|
|
if (optind < argc)
|
||
|
|
optarg = argv[optind++];
|
||
|
|
else {
|
||
|
|
optarg = NULL;
|
||
|
|
return (opterr ? (int)'?' : (int)*pArgString);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
pIndexPosition = NULL; /* not in the middle of anything */
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
/* it's not a colon, so just return the letter */
|
||
|
|
optarg = NULL; /* no argument follows the option */
|
||
|
|
pIndexPosition = pArgString; /* point to the letter we're on */
|
||
|
|
}
|
||
|
|
return (int)*pArgString; /* return the letter that matched */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif //WIN32
|