libconv/common/strproc.c

e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami/*
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * CDDL HEADER START
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * The contents of this file are subject to the terms of the
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * Common Development and Distribution License (the "License").
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * You may not use this file except in compliance with the License.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * or http://www.opensolaris.org/os/licensing.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * See the License for the specific language governing permissions
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e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami/*
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * Use is subject to license terms.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami/*
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * General purpse string manipulation routines
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami#include    <stdio.h>
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami#include    <_conv.h>
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami/*
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * Implementation of isspace() that does not require <ctype.h>
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * or <sys/ctype.h>, appropriate for simple non-localized use.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahramiint
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahramiconv_strproc_isspace(int c)
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami{
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    return ((c == ' ') || (c == '\t') || (c == '\r') || (c == '\n'));
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami}
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami/*
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * Remove leading and trailing whitespace from the given string.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * entry:
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  str - String to be trimmed
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * exit:
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  The pointer to the trimmed string is returned.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * note:
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  Leading whitespace is trimmed by advancing the given str pointer,
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  and not by making a copy or allocing more memory. Hence, the caller
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  should retain a copy of the original str pointer if they need to
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  free the original memory or otherwise access it.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  Trailing whitespace is trimmed by inserting a NULL termination
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  in the position at which the first trailing whitespce character
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  lies. This routine can therefore modify the memory used by
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  the input string.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahramichar *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahramiconv_strproc_trim(char *str)
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami{
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    char    *tail;
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    /* Skip leading whitespace */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    while (conv_strproc_isspace(*str))
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami        str++;
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    /* Back up over trailing whitespace */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    tail = str + strlen(str);
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    while ((tail > str) && conv_strproc_isspace(*(tail - 1)))
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami        tail--;
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    *tail = '\0';
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    return (str);
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami}
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami/*
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * Given a debug token of the form:
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  token=value
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * extract and return a pointer to the value.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * entry:
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  str - String to process
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  token_len = Length of the token, not counting the '=' character,
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *      or any whitespace between the token and the '='.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  to_upper - True to convert the returned value to upper case.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  value - Address of pointer to receive the value string.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * exit:
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  On success, *value is updated to point at the value string,
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  and True (1) is returned. On failure, False (0) is returned.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami * note:
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  If CONV_SPEXV_F_UCASE is specified, this routine modifies
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami *  the memory pointed at by str.
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami */
e23c41c9edb2294649cde3d370ae755701f3f140Ali BahramiBoolean
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahramiconv_strproc_extract_value(char *str, size_t token_len, int flags,
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    const char **value)
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami{
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    int trim = (flags & CONV_SPEXV_F_NOTRIM) == 0;
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    /* Skip the token */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    str += token_len;
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    /*
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami     * If TRIM, skip whitespace between token and '='
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami     */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    if (trim)
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami        while (conv_strproc_isspace(*str))
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami            str++;
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    /* If there's not a '=' here, this isn't the token we thought it was */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    if (*str != '=')
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami        return (FALSE);
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    str++;          /* skip the '=' */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    /* if TRIM, skip whitespace following the '=' */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    if (trim)
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami        while (conv_strproc_isspace(*str))
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami            str++;
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    /* Null value and it's not OK? Make it an error. */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    if (((flags & CONV_SPEXV_F_NULLOK) == 0) && (*str == '\0'))
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami        return (FALSE);
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    *value = str;
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    /* Convert to uppercase on request */
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    if (flags & CONV_SPEXV_F_UCASE)
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami        for (; *str; str++)
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami            if ((*str >= 'a') && (*str <= 'z'))
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami                *str = *str - ('a' - 'A');
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami    return (TRUE);
e23c41c9edb2294649cde3d370ae755701f3f140Ali Bahrami}