libldap4/common/dsparse.c

/*
 * Portions Copyright 1998 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * Copyright (c) 1993, 1994 Regents of the University of Michigan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of Michigan at Ann Arbor. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 *
 * dsparse.c:  parsing routines used by display template and search
 * preference file library routines for LDAP clients.
 *
 * 7 March 1994 by Mark C Smith
 */

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#ifdef MACOS
#include <stdlib.h>
#include "macos.h"
#else /* MACOS */
#ifdef DOS
#include <malloc.h>
#include "msdos.h"
#else /* DOS */
#include <sys/types.h>
#include <sys/file.h>
#include <stdlib.h>
#endif /* DOS */
#endif /* MACOS */

#include "lber.h"
#include "ldap.h"
#include "ldap-private.h"
#include "ldap-int.h"

#ifndef NEEDPROTOS
int next_line_tokens();
static ssize_t next_line();
static char *next_token();
#else /* !NEEDPROTOS */
int next_line_tokens( char **bufp, ssize_t *blenp, char ***toksp );
static ssize_t next_line( char **bufp, ssize_t *blenp, char **linep );
static char *next_token( char ** sp );
#endif /* !NEEDPROTOS */


int
next_line_tokens( char **bufp, ssize_t *blenp, char ***toksp )
{
    char    *p, *line, *token, **toks;
    ssize_t rc;
    int     tokcnt;

    *toksp = NULL;

    if (( rc = next_line( bufp, blenp, &line )) <= 0 ) {
    return( (int)rc );
    }

    if (( toks = (char **)calloc( (size_t) 1, sizeof( char * ))) == NULL ) {
    free( line );
    return( -1 );
    }
    tokcnt = 0;

    p = line;
    while (( token = next_token( &p )) != NULL ) {
    if (( toks = (char **)realloc( toks, ( tokcnt + 2 ) *
        sizeof( char * ))) == NULL ) {
        free( (char *)toks );
        free( line );
        return( -1 );
    }
    toks[ tokcnt ] = token;
    toks[ ++tokcnt ] = NULL;
    }

    if ( tokcnt == 1 && strcasecmp( toks[ 0 ], "END" ) == 0 ) {
    tokcnt = 0;
    free_strarray( toks );
    toks = NULL;
    }

    free( line );

    if ( tokcnt == 0 ) {
    if ( toks != NULL ) {
        free( (char *)toks );
    }
    } else {
    *toksp = toks;
    }

    return( tokcnt );
}


static ssize_t
next_line( char **bufp, ssize_t *blenp, char **linep )
{
    char    *linestart, *line, *p;
    ssize_t plen;

    linestart = *bufp;
    p = *bufp;
    plen = *blenp;

    do {
    for ( linestart = p; plen > 0; ++p, --plen ) {
        if ( *p == '\r' ) {
        if ( plen > 1 && *(p+1) == '\n' ) {
            ++p;
            --plen;
        }
        break;
        }

        if ( *p == '\n' ) {
        if ( plen > 1 && *(p+1) == '\r' ) {
            ++p;
            --plen;
        }
        break;
        }
    }
    ++p;
    --plen;
    } while ( plen > 0 && ( *linestart == '#' || linestart + 1 == p ));


    *bufp = p;
    *blenp = plen;


    if ( plen <= 0 ) {
    *linep = NULL;
    return( 0 );    /* end of file */
    }

    if (( line = malloc( p - linestart )) == NULL ) {
    *linep = NULL;
    return( -1 );   /* fatal error */
    }

    (void) memcpy( line, linestart, p - linestart );
    line[ p - linestart - 1 ] = '\0';
    *linep = line;
    return( strlen( line ));
}


static char *
next_token( char **sp )
{
    int     in_quote = 0;
    char    *p, *tokstart, *t;

    if ( **sp == '\0' ) {
    return( NULL );
    }

    p = *sp;

    while ( isspace( *p )) {        /* skip leading white space */
    ++p;
    }

    if ( *p == '\0' ) {
    return( NULL );
    }

    if ( *p == '\"' ) {
    in_quote = 1;
    ++p;
    }
    t = tokstart = p;

    for ( ;; ) {
    if ( *p == '\0' || ( isspace( *p ) && !in_quote )) {
        if ( *p != '\0' ) {
        ++p;
        }
        *t++ = '\0';        /* end of token */
        break;
    }

    if ( *p == '\"' ) {
        in_quote = !in_quote;
        ++p;
    } else {
        *t++ = *p++;
    }
    }

    *sp = p;

    if ( t == tokstart ) {
    return( NULL );
    }

    return( strdup( tokstart ));
}