~ubuntu-branches/ubuntu/intrepid/xterm/intrepid-security

/* $XTermId: xstrings.c,v 1.26 2007/06/09 13:43:00 tom Exp $ */

/* $XFree86: xc/programs/xterm/xstrings.c,v 1.10 2006/02/13 01:14:59 dickey Exp $ */

/************************************************************

Copyright 2000-2006,2007 by Thomas E. Dickey

                        All Rights Reserved

Permission is hereby granted, free of charge, to any person obtaining a

copy of this software and associated documentation files (the

"Software"), to deal in the Software without restriction, including

without limitation the rights to use, copy, modify, merge, publish,

distribute, sublicense, and/or sell copies of the Software, and to

permit persons to whom the Software is furnished to do so, subject to

the following conditions:

The above copyright notice and this permission notice shall be included

in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY

CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name(s) of the above copyright

holders shall not be used in advertising or otherwise to promote the

sale, use or other dealings in this Software without prior written

authorization.

********************************************************/

#include <xterm.h>

#include <sys/types.h>

#include <string.h>

#include <ctype.h>

#include <xstrings.h>

char *

x_basename(char *name)

{

    char *cp;

    cp = strrchr(name, '/');

#ifdef __UNIXOS2__

    if (cp == 0)

	cp = strrchr(name, '\\');

#endif

    return (cp ? cp + 1 : name);

}

char *

x_getenv(const char *name)

{

    return x_nonempty(getenv(name));

}

/*

 * Check if the given string is nonnull/nonempty.  If so, return a pointer

 * to the beginning of its content, otherwise return null.

 */

char *

x_nonempty(char *s)

{

    if (s != 0) {

	if (*s == '\0') {

	    s = 0;

	} else {

	    s = x_skip_blanks(s);

	    if (*s == '\0')

		s = 0;

	}

    }

    return s;

}

char *

x_skip_blanks(char *s)

{

    while (isspace(CharOf(*s)))

	++s;

    return s;

}

char *

x_skip_nonblanks(char *s)

{

    while (*s != '\0' && !isspace(CharOf(*s)))

	++s;

    return s;

}

int

x_strcasecmp(const char *s1, const char *s2)

{

    unsigned len = strlen(s1);

    if (len != strlen(s2))

	return 1;

    return x_strncasecmp(s1, s2, len);

}

int

x_strncasecmp(const char *s1, const char *s2, unsigned n)

{

    while (n-- != 0) {

	int c1 = toupper(CharOf(*s1));

	int c2 = toupper(CharOf(*s2));

	if (c1 != c2)

	    return 1;

	if (c1 == 0)

	    break;

	s1++, s2++;

    }

    return 0;

}

/*

 * Allocates a copy of a string

 */

char *

x_strdup(const char *s)

{

    char *result = 0;

    if (s != 0) {

	char *t = CastMallocN(char, strlen(s));

	if (t != 0) {

	    strcpy(t, s);

	}

	result = t;

    }

    return result;

}

/*

 * Returns a pointer to the first occurrence of s2 in s1,

 * or NULL if there are none.

 */

char *

x_strindex(char *s1, char *s2)

{

    char *s3;

    size_t s2len = strlen(s2);

    while ((s3 = strchr(s1, *s2)) != NULL) {

	if (strncmp(s3, s2, s2len) == 0)

	    return (s3);

	s1 = ++s3;

    }

    return (NULL);

}

/*

 * Trims leading/trailing spaces from a copy of the string.

 */

char *

x_strtrim(char *s)

{

    char *base = s;

    char *d;

    if (s != 0 && *s != '\0') {

	char *t = x_strdup(base);

	s = t;

	d = s;

	s = x_skip_blanks(s);

	while ((*d++ = *s++) != '\0') {

	    ;

	}

	if (*t != '\0') {

	    s = t + strlen(t);

	    while (s != t && isspace(CharOf(s[-1]))) {

		*--s = '\0';

	    }

	}

	base = t;

    }

    return base;

}