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/* Copyright (C) 1997, 1998, 1999 Aladdin Enterprises.  All rights reserved.

  This software is provided AS-IS with no warranty, either express or

  implied.

  This software is distributed under license and may not be copied,

  modified or distributed except as expressly authorized under the terms

  of the license contained in the file LICENSE in this distribution.

  For more information about licensing, please refer to

  http://www.ghostscript.com/licensing/. For information on

  commercial licensing, go to http://www.artifex.com/licensing/ or

  contact Artifex Software, Inc., 101 Lucas Valley Road #110,

  San Rafael, CA  94903, U.S.A., +1(415)492-9861.

*/

/* $Id: gsargs.c,v 1.9 2004/08/04 23:33:29 stefan Exp $ */

/* Command line argument list management */

#include "ctype_.h"

#include "stdio_.h"

#include "string_.h"

#include "gsexit.h"

#include "gsmemory.h"

#include "gsargs.h"

#include "gserrors.h"

/* Initialize an arg list. */

void

arg_init(arg_list * pal, const char **argv, int argc,

	 FILE * (*arg_fopen) (const char *fname, void *fopen_data),

	 void *fopen_data)

{

    pal->expand_ats = true;

    pal->arg_fopen = arg_fopen;

    pal->fopen_data = fopen_data;

    pal->argp = argv + 1;

    pal->argn = argc - 1;

    pal->depth = 0;

}

/* Push a string onto an arg list. */

int

arg_push_memory_string(arg_list * pal, char *str, gs_memory_t * mem)

{

    arg_source *pas;

    if (pal->depth == arg_depth_max) {

	lprintf("Too much nesting of @-files.\n");

	return 1;

    }

    pas = &pal->sources[pal->depth];

    pas->is_file = false;

    pas->u.s.chars = str;

    pas->u.s.memory = mem;

    pas->u.s.str = str;

    pal->depth++;

    return 0;

}

/* Clean up an arg list. */

void

arg_finit(arg_list * pal)

{

    while (pal->depth) {

	arg_source *pas = &pal->sources[--(pal->depth)];

	if (pas->is_file)

	    fclose(pas->u.file);

	else if (pas->u.s.memory)

	    gs_free_object(pas->u.s.memory, pas->u.s.chars, "arg_finit");

    }

}

/* Get the next arg from a list. */

/* Note that these are not copied to the heap. */

const char *

arg_next(arg_list * pal, int *code)

{

    arg_source *pas;

    FILE *f;

    const char *astr = 0;	/* initialized only to pacify gcc */

    char *cstr;

    const char *result;

    int endc;

    int c, i;

    bool in_quote, eol;

  top:pas = &pal->sources[pal->depth - 1];

    if (pal->depth == 0) {

	if (pal->argn <= 0)	/* all done */

	    return 0;

	pal->argn--;

	result = *(pal->argp++);

	goto at;

    }

    if (pas->is_file)

	f = pas->u.file, endc = EOF;

    else

	astr = pas->u.s.str, f = NULL, endc = 0;

    result = cstr = pal->cstr;

#define cfsgetc() (f == NULL ? (*astr ? *astr++ : 0) : fgetc(f))

#define is_eol(c) (c == '\r' || c == '\n')

    i = 0;

    in_quote = false;

    eol = true;

    c = cfsgetc();

    for (i = 0;;) {

	if (c == endc) {

	    if (in_quote) {

		cstr[i] = 0;

		errprintf("Unterminated quote in @-file: %s\n", cstr);

		*code = gs_error_Fatal;

		return NULL;

	    }

	    if (i == 0) {

		/* EOF before any argument characters. */

		if (f != NULL)

		    fclose(f);

		else if (pas->u.s.memory)

		    gs_free_object(pas->u.s.memory, pas->u.s.chars,

				   "arg_next");

		pal->depth--;

		goto top;

	    }

	    break;

	}

	/* c != endc */

	if (isspace(c)) {

	    if (i == 0) {

		c = cfsgetc();

		continue;

	    }

	    if (!in_quote)

		break;

	}

	/* c isn't leading or terminating whitespace. */

	if (c == '#' && eol) {

	    /* Skip a comment. */

	    do {

		c = cfsgetc();

	    } while (!(c == endc || is_eol(c)));

	    if (c == '\r')

		c = cfsgetc();

	    if (c == '\n')

		c = cfsgetc();

	    continue;

	}

	if (c == '\\') {

	    /* Check for \ followed by newline. */

	    c = cfsgetc();

	    if (is_eol(c)) {

		if (c == '\r')

		    c = cfsgetc();

		if (c == '\n')

		    c = cfsgetc();

		eol = true;

		continue;

	    }

	    /* \ anywhere else is treated as a printing character. */

	    /* This is different from the Unix shells. */

	    if (i == arg_str_max - 1) {

		cstr[i] = 0;

		errprintf("Command too long: %s\n", cstr);

		*code = gs_error_Fatal;

		return NULL;

	    }

	    cstr[i++] = '\\';

	    eol = false;

	    continue;

	}

	/* c will become part of the argument */

	if (i == arg_str_max - 1) {

	    cstr[i] = 0;

	    errprintf("Command too long: %s\n", cstr);

	    *code = gs_error_Fatal;

	    return NULL;

	}

	/* If input is coming from an @-file, allow quotes */

	/* to protect whitespace. */

	if (c == '"' && f != NULL)

	    in_quote = !in_quote;

	else

	    cstr[i++] = c;

	eol = is_eol(c);

	c = cfsgetc();

    }

    cstr[i] = 0;

    if (f == NULL)

	pas->u.s.str = astr;

  at:if (pal->expand_ats && result[0] == '@') {

	if (pal->depth == arg_depth_max) {

	    lprintf("Too much nesting of @-files.\n");

	    *code = gs_error_Fatal;

	    return NULL;

	}

	result++;		/* skip @ */

	f = (*pal->arg_fopen) (result, pal->fopen_data);

	if (f == NULL) {

	    errprintf("Unable to open command line file %s\n", result);

	    *code = gs_error_Fatal;

	    return NULL;

	}

	pal->depth++;

	pas++;

	pas->is_file = true;

	pas->u.file = f;

	goto top;

    }

    return result;

}

/* Copy an argument string to the heap. */

char *

arg_copy(const char *str, gs_memory_t * mem)

{

    char *sstr = (char *)gs_alloc_bytes(mem, strlen(str) + 1, "arg_copy");

    if (sstr == 0) {

	lprintf("Out of memory!\n");

	return NULL;

    }

    strcpy(sstr, str);

    return sstr;

}