port/gen/parse.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
 */

#include "lint.h"
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <secdb.h>

/*
 * _strtok_escape()
 *   Like strtok_r, except we don't break on a token if it is escaped
 *   with the escape character (\).
 */
char *
_strtok_escape(char *string, const char *sepset, char **lasts)
{
    char    *r;

    /* first or subsequent call */
    if (string == NULL)
        string = *lasts;

    if (string == 0)        /* return if no tokens remaining */
        return (NULL);

    if (*string == '\0')        /* return if no tokens remaining */
        return (NULL);

    /* move past token */
    if ((r = _strpbrk_escape(string, sepset)) == NULL)
        *lasts = 0; /* indicate this is last token */
    else {
        *r = '\0';
        *lasts = r+1;
    }
    return (string);
}

/*
 * Return ptr to first occurrence of any non-escaped character from `brkset'
 * in the character string `string'; NULL if none exists.
 */
char *
_strpbrk_escape(const char *string, const char *brkset)
{
    const char *p;
    const char *first = string;

    do {
        for (p = brkset; *p != '\0' && *p != *string; ++p)
            ;
        if (*p != '\0') {
            if (first == string || *(string - 1) != '\\')
                return ((char *)string);
        }
    } while (*string++);

    return (NULL);
}


char   *
_escape(const char *s, const char *esc)
{
    int nescs = 0;  /* number of escapes to place in s */
    int i, j;
    int len_s;
    char    *tmp;

    if (s == NULL || esc == NULL)
        return (NULL);

    len_s = strlen(s);
    /* Invalid string */
    if (len_s > 0 && s[len_s - 1] == '\\')
        return (NULL);
    for (i = 0; i < len_s; i++)
        if (strchr(esc, s[i]))
            nescs++;
    if ((tmp = malloc(nescs + len_s + 1)) == NULL)
        return (NULL);
    for (i = 0, j = 0; i < len_s; i++) {
        if (strchr(esc, s[i])) {
            tmp[j++] = '\\';
        }
        tmp[j++] = s[i];
    }
    tmp[len_s + nescs] = '\0';
    return (tmp);
}


char *
_unescape(const char *s, const char *esc)
{
    int len_s;
    int i, j;
    char    *tmp;

    if (s == NULL || esc == NULL)
        return (NULL);

    len_s = strlen(s);
    if ((tmp = malloc(len_s + 1)) == NULL)
        return (NULL);
    for (i = 0, j = 0; i < len_s; i++) {
        if (s[i] == '\\' && strchr(esc, s[i + 1]))
            tmp[j++] = s[++i];
        else
            tmp[j++] = s[i];
    }
    tmp[j] = NULL;
    return (tmp);
}

char *
_strdup_null(const char *s)
{
    return (strdup(s ? s : ""));
}


/*
 * read a line into buffer from a mmap'ed file.
 * return length of line read.
 */
int
_readbufline(char *mapbuf,  /* input mmap buffer */
    int mapsize,        /* input size */
    char *buffer,       /* output storage */
    int buflen,         /* output size */
    int *lastlen)       /* input read till here last time */
{
    int linelen;

    for (;;) {
        linelen = 0;
        while (linelen < buflen - 1) {  /* "- 1" saves room for \n\0 */
            if (*lastlen >= mapsize) {
                if (linelen == 0 ||
                    buffer[linelen - 1] == '\\') {
                        return (-1);
                    } else {
                        buffer[linelen] = '\n';
                        buffer[linelen + 1] = '\0';
                        return (linelen);
                    }
            }
            switch (mapbuf[*lastlen]) {
            case '\n':
                (*lastlen)++;
                if (linelen > 0 &&
                    buffer[linelen - 1] == '\\') {
                    --linelen;  /* remove the '\\' */
                } else {
                    buffer[linelen] = '\n';
                    buffer[linelen + 1] = '\0';
                    return (linelen);
                }
                break;
            default:
                buffer[linelen] = mapbuf[*lastlen];
                (*lastlen)++;
                linelen++;
            }
        }
        /* Buffer overflow -- eat rest of line and loop again */
        while (mapbuf[*lastlen] != '\n') {
            if (mapbuf[*lastlen] == EOF) {
                return (-1);
            }
            (*lastlen)++;
        };
    }
    /* NOTREACHED */
}