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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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v_08_07
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8n07047a
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1990-06-17
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------------------------------------------------------
LISTING 3
/* Options.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "Options.h"
struct tOPTIONS{
int argc, next;
char **argv;
boolean *used;
};
typedef struct tOPTIONS OPTIONS;
#define this ((OPTIONS *)options)
static void
ErrorExit( char *format, ...){
va_list ap;
va_start( ap, format);
fprintf( stderr, "Error: ");
vfprintf( stderr, format, ap);
fprintf( stderr, "!\nAborting.\n");
exit(1);
va_end( ap );
}
boolean
IsSwitch( Options options, const char switch_character){
int k =0;
for( ;k < this->argc; k++ )
if( this->argv[k][0] == '-' &&
this->argv[k][1] == switch_character
)return (this->used[k] =TRUE);
return FALSE;
}
char *
GetParameter( Options options, const char switch_character){
int k =1;
for( ;k < this->argc; k++ )
if( this->argv[k][0] == '-' &&
this->argv[k][1] == switch_character
){
this->used[k++] =TRUE;
this->used[k] =TRUE;
return this->argv[k];
}
return NULL;
}
boolean
IsMoreSwitches( Options options ){
int k =0;
for(; k < this->argc; k++)
if( !this->used[k] && this->argv[k][0] == '-' )
return TRUE;
return FALSE;
}
char *
GetNextOption( Options options ){
for( ;this->next < this->argc; this->next++)
if( !this->used[this->next] &&
this->argv[this->next][0] != '-'
)return( this->argv[this->next++] );
return NULL;
}
Options
CreateOptions(void){
OPTIONS *opt;
if( (opt =calloc( 1, sizeof(OPTIONS))) == NULL )
ErrorExit("Out of memory in CreateOptions()");
opt->argc =0;
opt->argv =NULL;
opt->next =0;
opt->used =NULL;
return (Options)opt;
}
void
PutArgs( Options options, const int argc, char **argv){
this->argc =argc -1;/* ignore the program name */
this->argv =argv +1;/* in argv[0] */
this->next =0;
if( (this->used =calloc(this->argc,sizeof(boolean)))
== NULL )ErrorExit("Out of memory in PutArgs()");
{ int k=0;
while( k < this->argc )
this->used[k++] =FALSE;
}
}
void
DestroyOptions( Options options){
if( this->used )free( this->used );
free( this );
}