usr.bin/window/string.c

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