366 lines
8.9 KiB
C
366 lines
8.9 KiB
C
// Copyright (c) 1998-1999 Microsoft Corporation
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/*******************************************************************************
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*
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* SETARGV.C (ANSI argc, argv routines)
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*
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* argc / argv routines
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*
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*
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******************************************************************************/
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/*
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* Include files
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*/
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#include <windows.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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/*
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* ANSI ARGS structure and other stuff (private).
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*/
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#include "setargv.h"
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/*
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* Local function prototypes.
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*/
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void args_init(ARGS *);
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int add_arg_to_list(char *, ARGS *);
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int args_trunc(ARGS *);
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/*
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* setargv()
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*
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* Forms a standard C-runtime argc, argv parsed command line.
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*
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* ENTRY:
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* szModuleName (input)
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* Optional Windows module name. If not NULL, will be added as first
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* parsed argument (argv[0], argc=1).
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* szCmdLine (input)
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* Points to command line to parse into argc, argv
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* argc (output)
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* Points to int to save argument count into on exit.
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* argv (output)
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* Points to (char **) to save argv array into on exit.
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*
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* RETURNS:
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* ERROR_SUCCESS if ok; ERROR_xxx code if not ok.
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*
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* A typical use of this routine is by a Windows UI application to
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* convert a command line into the C argc & argv variables prior to calling
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* the utilsub.lib ParseCommandLine() function. Therefore, a companion
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* routine, freeargv(), allows for alloc'd memory to be freed by the caller
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* after use, if desired.
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*
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*/
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int WINAPI
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setargv( LPSTR szModuleName,
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LPSTR szCmdLine,
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int *argc,
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char ***argv )
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{
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int rc;
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char *cp;
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char FAR *cfp = szCmdLine;
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char ch, fname[_MAX_PATH];
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ARGS arg_data;
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/*
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* Initialize arg_data
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*/
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args_init( &arg_data );
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/*
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* If present, add module name as argv[0].
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*/
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if ( szModuleName ) {
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if ( (rc = add_arg_to_list( szModuleName, &arg_data )) != ERROR_SUCCESS )
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goto setargv_error;
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}
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/*
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* Skip leading blanks/tabs of remaining args
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*/
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cp = fname;
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/* skip consecutive blanks and/or tabs */
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while ( (ch = *cfp) == ' ' || ch == '\t' )
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cfp++;
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/*
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* Process remainder of command line
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*/
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while ( ch = *cfp++ ) {
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/*
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* Process quoted strings.
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*/
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if ( ch == '"' ) {
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while ( (ch = *cfp++) && ch != '"' )
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*cp++ = ch;
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if ( ch == '\0' )
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cfp--;
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/*
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* If we find a delimeter, process the pathname we just scanned.
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*/
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} else if ( ch == ' ' || ch == '\t') {
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*cp = '\0';
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if ( (rc = add_arg_to_list( fname, &arg_data )) != ERROR_SUCCESS )
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goto setargv_error;
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cp = fname;
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/* skip consecutive blanks and/or tabs */
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while ( (ch = *cfp) == ' ' || ch == '\t')
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cfp++;
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/*
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* All other chars, just copy to internal buffer.
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*/
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} else {
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*cp++ = ch;
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}
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}
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if ( cp != fname ) {
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*cp = '\0';
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if ( (rc = add_arg_to_list( fname, &arg_data )) != ERROR_SUCCESS )
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goto setargv_error;
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}
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if ( (rc = args_trunc( &arg_data )) != ERROR_SUCCESS )
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goto setargv_error;
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/*
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* Initialize global variables __argc and __argv
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*/
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*argc = arg_data.argc;
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*argv = arg_data.argv;
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return(ERROR_SUCCESS);
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//--------------
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// Error return
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//--------------
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setargv_error:
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return(rc);
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}
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/*
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* freeargv()
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*
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* Frees up the memory alloc'd for argv strings and argv
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* array itself.
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*
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* ENTER:
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* argv = argv array as created by this setargv() routine.
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*
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*/
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void WINAPI
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freeargv( char **argv )
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{
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free(*argv);
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free(argv);
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}
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/*
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* args_init()
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*
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* Initialize the ARGS struct passed as an argument.
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*
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* ENTER:
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* argp = pointer to ARGS struct
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*
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*/
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static void
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args_init( ARGS *argp )
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{
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argp->argc = 0;
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argp->argv = NULL;
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argp->argvlen = 0;
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argp->argvp = NULL;
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argp->buflen = 0;
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argp->buf = argp->bufptr = argp->bufend = NULL;
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}
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/*
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* add_arg_to_list()
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*
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* This routine adds the specified argument string to the argv array,
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* and increments the argv pointer and argc counter.
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* If necessary, memory for the argument string is allocated.
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*
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* RETURNS:
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* ERROR_SUCCESS if ok; ERROR_NOT_ENOUGH_MEMORY if not.
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*
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*/
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static int
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add_arg_to_list( char *arg_string,
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ARGS *argp )
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{
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int len;
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#ifdef notdef
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printf( "add_arg_to_list: arg_string=%s:, argc=%d, argvp=%x",
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arg_string,argp->argc,argp->argvp );
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#endif
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/*
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* Verify we have an argv array buffer.
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* If we have one but it is full, expand the array.
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* If we can't alloc/realloc the array, return an error.
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*/
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if ( !argp->argv ) {
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argp->argvlen = MIN_ARG_ALLOC;
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argp->argc = 0;
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argp->argv = malloc( argp->argvlen * sizeof( char *) );
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argp->argvp = argp->argv;
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} else if ( argp->argc + 1 >= argp->argvlen ) {
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argp->argvlen += MIN_ARG_ALLOC;
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argp->argv = realloc( argp->argv, argp->argvlen * sizeof(char *) );
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argp->argvp = argp->argv + argp->argc;
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}
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if ( !argp->argv ) {
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#ifdef notdef
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printf("add_arg_to_list: failed to (re)alloc argv buf\n");
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#endif
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goto add_arg_to_list_error;
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}
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/*
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* Verify we have a string buffer to store the argument string.
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* If we have one but there is not room for the new arg, expand the
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* buffer. If we can't alloc/realloc the buffer, return an error.
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*/
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len = strlen( arg_string ) + 1;
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if ( !argp->buf ) {
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argp->buflen = MIN_BUF_ALLOC;
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while ( argp->buflen < len )
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argp->buflen += MIN_BUF_ALLOC;
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argp->buf = malloc( argp->buflen );
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argp->bufptr = argp->buf;
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argp->bufend = argp->buf + argp->buflen - 1;
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} else if ( argp->bufptr + len > argp->bufend ) {
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char *old_buf;
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int buf_offset = argp->bufptr - argp->buf;
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while ( argp->buflen < buf_offset + len )
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argp->buflen += MIN_BUF_ALLOC;
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old_buf = argp->buf;
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argp->buf = realloc( argp->buf, argp->buflen );
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argp->bufend = argp->buf + argp->buflen - 1;
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argp->bufptr = argp->buf + buf_offset;
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/*
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* If the argument string buffer moved, then we need to relocate the
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* argv pointers in the argv array to point to the new string locations.
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*/
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if ( argp->buf != old_buf ) {
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char *buf_ptr, **argv_ptr;
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argv_ptr = argp->argv;
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buf_ptr = argp->buf;
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while ( buf_ptr != argp->bufptr ) {
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*argv_ptr++ = buf_ptr;
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buf_ptr += strlen( buf_ptr ) + 1;
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}
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}
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}
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if ( !argp->buf ) {
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#ifdef notdef
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printf("add_arg_to_list: failed to (re)alloc string buf\n");
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#endif
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goto add_arg_to_list_error;
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}
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/*
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* Add the new argument to the buffer and the argv array.
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* Increment the arg count, the argv pointer, and the buffer pointer.
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*/
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strcpy( argp->bufptr, arg_string );
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*(argp->argvp) = argp->bufptr;
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argp->bufptr += len;
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++argp->argc;
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++argp->argvp;
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*(argp->argvp) = NULL;
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return(ERROR_SUCCESS);
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//--------------
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// Error return
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//--------------
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add_arg_to_list_error:
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return(ERROR_NOT_ENOUGH_MEMORY);
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}
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/*
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* args_trunc()
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*
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* Truncate the memory used by the ARGS struct
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* so that unused memory is freed.
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*
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* ENTER:
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* argp = pointer to ARGS struct
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*
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* RETURNS:
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* ERROR_SUCCESS if ok; ERROR_NOT_ENOUGH_MEMORY code if not ok.
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*
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*/
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static int
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args_trunc( ARGS *argp )
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{
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char *old_buf;
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/*
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* call realloc to shrink size of argv array, set argvlen = argc
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* to indicate no more room in argv array.
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*/
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argp->argvlen = argp->argc + 1;
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argp->argv = realloc( argp->argv, argp->argvlen * sizeof(char *) );
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if ( !argp->argv )
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goto args_trunc_error;
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argp->argvp = argp->argv + argp->argc;
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/*
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* call realloc to shrink size of argument string buffer, set bufend
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* pointer to end of buffer to indicate buf is full.
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*/
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old_buf = argp->buf;
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argp->buflen = argp->bufptr - argp->buf;
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argp->buf = realloc( argp->buf, argp->buflen );
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if ( !argp->buf )
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goto args_trunc_error;
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argp->bufptr = argp->buf + argp->buflen;
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argp->bufend = argp->buf + argp->buflen - 1;
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/*
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* If the argument string buffer moved, then we need to relocate the
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* argv pointers in the argv array to point to the new string locations.
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*/
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if ( old_buf != argp->buf ) {
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char *buf_ptr, **argv_ptr;
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argv_ptr = argp->argv;
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buf_ptr = argp->buf;
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while ( buf_ptr != argp->bufptr ) {
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*argv_ptr++ = buf_ptr;
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buf_ptr += strlen( buf_ptr ) + 1;
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}
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}
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return(ERROR_SUCCESS);
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//--------------
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// Error return
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//--------------
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args_trunc_error:
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return(ERROR_NOT_ENOUGH_MEMORY);
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}
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