usr.bin/window/string.c

   1 /*      $NetBSD: string.c,v 1.9 2003/08/07 11:17:29 agc Exp $   */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)string.c    8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: string.c,v 1.9 2003/08/07 11:17:29 agc Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #define EXTERN
  48 #include "window_string.h"
  49 #undef  EXTERN
  50
  51 char *
  52 str_cpy(const char *s)
  53 {
  54         char *str;
  55         char *p;
  56
  57         str = p = str_alloc(strlen(s) + 1);
  58         if (p == 0)
  59                 return 0;
  60         while ((*p++ = *s++))
  61                 ;
  62         return str;
  63 }
  64
  65 char *
  66 str_ncpy(const char *s, int n)
  67 {
  68         int l = strlen(s);
  69         char *str;
  70         char *p;
  71
  72         if (n > l)
  73                 n = l;
  74         str = p = str_alloc(n + 1);
  75         if (p == 0)
  76                 return 0;
  77         while (--n >= 0)
  78                 *p++ = *s++;
  79         *p = 0;
  80         return str;
  81 }
  82
  83 char *
  84 str_itoa(int i)
  85 {
  86         char buf[30];
  87
  88         (void) snprintf(buf, sizeof(buf), "%d", i);
  89         return str_cpy(buf);
  90 }
  91
  92 char *
  93 str_cat(const char *s1, const char *s2)
  94 {
  95         char *str;
  96         char *p;
  97         const char *q;
  98
  99         str = p = str_alloc(strlen(s1) + strlen(s2) + 1);
 100         if (p == 0)
 101                 return 0;
 102         for (q = s1; (*p++ = *q++);)
 103                 ;
 104         for (q = s2, p--; (*p++ = *q++);)
 105                 ;
 106         return str;
 107 }
 108
 109 /*
 110  * match s against p.
 111  * s can be a prefix of p with at least min characters.
 112  */
 113 int
 114 str_match(const char *s, const char *p, int min)
 115 {
 116         for (; *s && *p && *s == *p; s++, p++, min--)
 117                 ;
 118         return *s == *p || (*s == 0 && min <= 0);
 119 }
 120
 121 #ifdef STR_DEBUG
 122 char *
 123 str_alloc(size_t l)
 124 {
 125         struct string *s;
 126
 127         s = (struct string *) malloc(l + str_offset);
 128         if (s == 0)
 129                 return 0;
 130         if (str_head.s_forw == 0)
 131                 str_head.s_forw = str_head.s_back = &str_head;
 132         s->s_forw = str_head.s_forw;
 133         s->s_back = &str_head;
 134         str_head.s_forw = s;
 135         s->s_forw->s_back = s;
 136         return s->s_data;
 137 }
 138
 139 void
 140 str_free(char *str)
 141 {
 142         struct string *s;
 143
 144         for (s = str_head.s_forw; s != &str_head && s->s_data != str;
 145              s = s->s_forw)
 146                 ;
 147         if (s == &str_head)
 148                 abort();
 149         s->s_back->s_forw = s->s_forw;
 150         s->s_forw->s_back = s->s_back;
 151         free((char *)s);
 152 }
 153 #endif