173 lines
5.4 KiB
C
173 lines
5.4 KiB
C
/*****************************************************************************/
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/* */
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/* cmdline.c */
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/* */
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/* Helper functions for command line parsing */
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/* */
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/* */
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/* */
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/* (C) 2000 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@musoftware.de */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#include <string.h>
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#include "abend.h"
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#include "cmdline.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Program name - is set after call to InitCmdLine */
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const char* ProgName;
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/* The program argument vector */
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static char** ArgVec = 0;
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static unsigned ArgCount = 0;
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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void InitCmdLine (unsigned aArgCount, char* aArgVec[], const char* aProgName)
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/* Initialize command line parsing. aArgVec is the argument array terminated by
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* a NULL pointer (as usual), ArgCount is the number of valid arguments in the
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* array. Both arguments are remembered in static storage.
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*/
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{
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/* Remember the argument vector */
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ArgCount = aArgCount;
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ArgVec = aArgVec;
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/* Get the program name from argv[0] but strip a path */
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if (ArgVec[0] == 0) {
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/* Use the default name given */
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ProgName = aProgName;
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} else {
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/* Strip a path */
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ProgName = strchr (ArgVec[0], '\0');
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while (ProgName > ArgVec[0]) {
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--ProgName;
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if (*ProgName == '/' || *ProgName == '\\') {
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++ProgName;
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break;
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}
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}
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if (ProgName[0] == '\0') {
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/* Use the default */
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ProgName = aProgName;
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}
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}
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}
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void UnknownOption (const char* Opt)
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/* Print an error about an unknown option. */
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{
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AbEnd ("Unknown option: %s\n", Opt);
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}
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void NeedArg (const char* Opt)
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/* Print an error about a missing option argument and exit. */
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{
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AbEnd ("Option requires an argument: %s\n", Opt);
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}
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void InvDef (const char* Def)
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/* Print an error about an invalid definition and die */
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{
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AbEnd ("Invalid definition: `%s'\n", Def);
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}
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const char* GetArg (int* ArgNum, unsigned Len)
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/* Get an argument for a short option. The argument may be appended to the
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* option itself or may be separate. Len is the length of the option string.
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*/
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{
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const char* Arg = ArgVec[*ArgNum];
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if (Arg[Len] != '\0') {
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/* Argument appended */
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return Arg + Len;
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} else {
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/* Separate argument */
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Arg = ArgVec[*ArgNum + 1];
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if (Arg == 0) {
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/* End of arguments */
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NeedArg (ArgVec[*ArgNum]);
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}
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++(*ArgNum);
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return Arg;
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}
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}
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void LongOption (int* ArgNum, const LongOpt* OptTab, unsigned OptCount)
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/* Handle a long command line option */
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{
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/* Get the option and the argument (which may be zero) */
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const char* Opt = ArgVec[*ArgNum];
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/* Search the table for a match */
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while (OptCount) {
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if (strcmp (Opt, OptTab->Option) == 0) {
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/* Found, call the function */
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if (OptTab->ArgCount > 0) {
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OptTab->Func (Opt, ArgVec[++(*ArgNum)]);
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} else {
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OptTab->Func (Opt, 0);
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}
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/* Done */
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return;
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}
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/* Next table entry */
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--OptCount;
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++OptTab;
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}
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/* Invalid option */
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UnknownOption (Opt);
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}
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