106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/* $Id: text.c,v 1.3 2003-03-13 05:20:06 rjkaes Exp $
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*
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* The functions included here are useful for text manipulation. They
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* replace or augment the standard C string library. These functions
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* are either safer replacements, or they provide services not included
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* with the standard C string library.
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*
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* Copyright (C) 2002 Robert James Kaes (rjkaes@flarenet.com)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include "tinyproxy.h"
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#include "text.h"
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#ifndef HAVE_STRLCPY
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/*
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* Function API taken from OpenBSD. Like strncpy(), but does not 0 fill the
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* buffer, and always NULL terminates the buffer. size is the size of the
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* destination buffer.
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*/
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size_t
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strlcpy(char *dst, const char *src, size_t size)
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{
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size_t len = strlen(src);
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size_t ret = len;
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if (len >= size)
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len = size - 1;
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memcpy(dst, src, len);
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dst[len] = '\0';
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return ret;
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}
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#endif
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#ifndef HAVE_STRLCAT
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/*
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* Function API taken from OpenBSD. Like strncat(), but does not 0 fill the
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* buffer, and always NULL terminates the buffer. size is the length of the
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* buffer, which should be one more than the maximum resulting string
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* length.
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*/
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size_t
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strlcat(char *dst, const char *src, size_t size)
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{
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size_t len1 = strlen(dst);
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size_t len2 = strlen(src);
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size_t ret = len1 + len2;
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if (len1 + len2 >= size)
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len2 = size - len1 - 1;
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if (len2 > 0) {
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memcpy(dst + len1, src, len2);
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dst[len1 + len2] = '\0';
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}
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return ret;
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}
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#endif
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/*
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* Removes any new-line or carriage-return characters from the end of the
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* string. This function is named after the same function in Perl.
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* "length" should be the number of characters in the buffer, not including
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* the trailing NULL.
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*
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* Returns the number of characters removed from the end of the string. A
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* negative return value indicates an error.
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*/
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ssize_t
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chomp(char *buffer, size_t length)
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{
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size_t chars;
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assert(buffer != NULL);
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assert(length > 0);
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/* Make sure the arguments are valid */
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if (buffer == NULL) return -EFAULT;
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if (length < 1) return -ERANGE;
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chars = 0;
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--length;
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while (buffer[length] == '\r' || buffer[length] == '\n') {
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buffer[length] = '\0';
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chars++;
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/* Stop once we get to zero to prevent wrap-around */
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if (length-- == 0) break;
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}
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return chars;
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}
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