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/*
* $Id$
*
* Copyright (c) 1999-2002, Darren Hiebert
*
* This source code is released for free distribution under the terms of the
* GNU General Public License.
*
* This module contains functions for reading command line arguments.
*/

/*
* INCLUDE FILES
*/
#include "general.h" /* must always come first */

#include <stdio.h>
#include <string.h>
#include <ctype.h>

#include "args.h"
#include "debug.h"
#include "routines.h"

/*
* FUNCTION DEFINITIONS
*/

static char *nextStringArg (const char** const next)
{
char* result = NULL;
const char* start;

Assert (*next != NULL);
for (start = *next ; isspace ((int) *start) ; ++start)
;
if (*start == '\0')
*next = start;
else
{
size_t length;
const char* end;

for (end = start ; *end != '\0' && ! isspace ((int) *end) ; ++end)
;
length = end - start;
Assert (length > 0);
result = xMalloc (length + 1, char);
strncpy (result, start, length);
result [length] = '\0';
*next = end;
}
return result;
}

static char* nextStringLine (const char** const next)
{
char* result = NULL;
size_t length;
const char* end;

Assert (*next != NULL);
for (end = *next ; *end != '\n' && *end != '\0' ; ++end)
;
length = end - *next;
if (length > 0)
{
result = xMalloc (length + 1, char);
strncpy (result, *next, length);
result [length] = '\0';
}
if (*end == '\n')
++end;
else if (*end == '\r')
{
++end;
if (*end == '\n')
++end;
}
*next = end;
return result;
}

static char* nextString (const Arguments* const current, const char** const next)
{
char* result;
if (current->lineMode)
result = nextStringLine (next);
else
result = nextStringArg (next);
return result;
}

static char* nextFileArg (FILE* const fp)
{
char* result = NULL;
Assert (fp != NULL);
if (! feof (fp))
{
vString* vs = vStringNew ();
int c;
do
c = fgetc (fp);
while (isspace (c));

if (c != EOF)
{
do
{
vStringPut (vs, c);
c = fgetc (fp);
} while (c != EOF && ! isspace (c));
vStringTerminate (vs);
Assert (vStringLength (vs) > 0);
result = xMalloc (vStringLength (vs) + 1, char);
strcpy (result, vStringValue (vs));
}
vStringDelete (vs);
}
return result;
}

static char* nextFileLine (FILE* const fp)
{
char* result = NULL;
if (! feof (fp))
{
vString* vs = vStringNew ();
int c;

Assert (fp != NULL);
c = fgetc (fp);
while (c != EOF)
{
if (c != '\n' && c != '\r')
vStringPut (vs, c);
else if (vStringLength (vs) > 0)
break;
c = fgetc (fp);
}
if (c != EOF || vStringLength (vs) > 0)
{
if (c == '\r')
{
c = fgetc (fp);
if (c != '\n')
c = ungetc (c, fp);
}
vStringTerminate (vs);
vStringStripTrailing (vs);
result = xMalloc (vStringLength (vs) + 1, char);
strcpy (result, vStringValue (vs));
}
vStringDelete (vs);
}
return result;
}

static char* nextFileString (const Arguments* const current, FILE* const fp)
{
char* result;
if (current->lineMode)
result = nextFileLine (fp);
else
result = nextFileArg (fp);
return result;
}

extern Arguments* argNewFromString (const char* const string)
{
Arguments* result = xMalloc (1, Arguments);
memset (result, 0, sizeof (Arguments));
result->type = ARG_STRING;
result->u.stringArgs.string = string;
result->u.stringArgs.item = string;
result->u.stringArgs.next = string;
result->item = nextString (result, &result->u.stringArgs.next);
return result;
}

extern Arguments* argNewFromArgv (char* const* const argv)
{
Arguments* result = xMalloc (1, Arguments);
memset (result, 0, sizeof (Arguments));
result->type = ARG_ARGV;
result->u.argvArgs.argv = argv;
result->u.argvArgs.item = result->u.argvArgs.argv;
result->item = *result->u.argvArgs.item;
return result;
}

extern Arguments* argNewFromFile (FILE* const fp)
{
Arguments* result = xMalloc (1, Arguments);
memset (result, 0, sizeof (Arguments));
result->type = ARG_FILE;
result->u.fileArgs.fp = fp;
result->item = nextFileString (result, result->u.fileArgs.fp);
return result;
}

extern Arguments* argNewFromLineFile (FILE* const fp)
{
Arguments* result = xMalloc (1, Arguments);
memset (result, 0, sizeof (Arguments));
result->type = ARG_FILE;
result->lineMode = TRUE;
result->u.fileArgs.fp = fp;
result->item = nextFileString (result, result->u.fileArgs.fp);
return result;
}

extern char *argItem (const Arguments* const current)
{
Assert (current != NULL);
Assert (! argOff (current));
return current->item;
}

extern boolean argOff (const Arguments* const current)
{
Assert (current != NULL);
return (boolean) (current->item == NULL);
}

extern void argSetWordMode (Arguments* const current)
{
Assert (current != NULL);
current->lineMode = FALSE;
}

extern void argSetLineMode (Arguments* const current)
{
Assert (current != NULL);
current->lineMode = TRUE;
}

extern void argForth (Arguments* const current)
{
Assert (current != NULL);
Assert (! argOff (current));
switch (current->type)
{
case ARG_STRING:
if (current->item != NULL)
eFree (current->item);
current->u.stringArgs.item = current->u.stringArgs.next;
current->item = nextString (current, &current->u.stringArgs.next);
break;
case ARG_ARGV:
++current->u.argvArgs.item;
current->item = *current->u.argvArgs.item;
break;
case ARG_FILE:
if (current->item != NULL)
eFree (current->item);
current->item = nextFileString (current, current->u.fileArgs.fp);
break;
default:
Assert ("Invalid argument type" == NULL);
break;
}
}

extern void argDelete (Arguments* const current)
{
Assert (current != NULL);
if (current->type == ARG_STRING && current->item != NULL)
eFree (current->item);
memset (current, 0, sizeof (Arguments));
eFree (current);
}

/* vi:set tabstop=4 shiftwidth=4: */
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