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Annotation of 43BSDReno/usr.bin/window/string.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 Regents of the University of California.
                      3:  * 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 are permitted provided
                      9:  * that: (1) source distributions retain this entire copyright notice and
                     10:  * comment, and (2) distributions including binaries display the following
                     11:  * acknowledgement:  ``This product includes software developed by the
                     12:  * University of California, Berkeley and its contributors'' in the
                     13:  * documentation or other materials provided with the distribution and in
                     14:  * all advertising materials mentioning features or use of this software.
                     15:  * Neither the name of the University nor the names of its contributors may
                     16:  * be used to endorse or promote products derived from this software without
                     17:  * specific prior written permission.
                     18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     21:  */
                     22: 
                     23: #ifndef lint
                     24: static char sccsid[] = "@(#)string.c   3.13 (Berkeley) 6/6/90";
                     25: #endif /* not lint */
                     26: 
                     27: #include "string.h"
                     28: 
                     29: char *malloc();
                     30: 
                     31: char *
                     32: str_cpy(s)
                     33: register char *s;
                     34: {
                     35:        char *str;
                     36:        register char *p;
                     37: 
                     38:        str = p = str_alloc(strlen(s) + 1);
                     39:        if (p == 0)
                     40:                return 0;
                     41:        while (*p++ = *s++)
                     42:                ;
                     43:        return str;
                     44: }
                     45: 
                     46: char *
                     47: str_ncpy(s, n)
                     48: register char *s;
                     49: register n;
                     50: {
                     51:        int l = strlen(s);
                     52:        char *str;
                     53:        register char *p;
                     54: 
                     55:        if (n > l)
                     56:                n = l;
                     57:        str = p = str_alloc(n + 1);
                     58:        if (p == 0)
                     59:                return 0;
                     60:        while (--n >= 0)
                     61:                *p++ = *s++;
                     62:        *p = 0;
                     63:        return str;
                     64: }
                     65: 
                     66: char *
                     67: str_itoa(i)
                     68: int i;
                     69: {
                     70:        char buf[30];
                     71: 
                     72:        (void) sprintf(buf, "%d", i);
                     73:        return str_cpy(buf);
                     74: }
                     75: 
                     76: char *
                     77: str_cat(s1, s2)
                     78: char *s1, *s2;
                     79: {
                     80:        char *str;
                     81:        register char *p, *q;
                     82: 
                     83:        str = p = str_alloc(strlen(s1) + strlen(s2) + 1);
                     84:        if (p == 0)
                     85:                return 0;
                     86:        for (q = s1; *p++ = *q++;)
                     87:                ;
                     88:        for (q = s2, p--; *p++ = *q++;)
                     89:                ;
                     90:        return str;
                     91: }
                     92: 
                     93: /*
                     94:  * match s against p.
                     95:  * s can be a prefix of p with at least min characters.
                     96:  */
                     97: str_match(s, p, min)
                     98: register char *s, *p;
                     99: register min;
                    100: {
                    101:        for (; *s && *p && *s == *p; s++, p++, min--)
                    102:                ;
                    103:        return *s == *p || *s == 0 && min <= 0;
                    104: }
                    105: 
                    106: #ifdef STR_DEBUG
                    107: char *
                    108: str_alloc(l)
                    109: int l;
                    110: {
                    111:        register struct string *s;
                    112: 
                    113:        s = (struct string *) malloc((unsigned)l + str_offset);
                    114:        if (s == 0)
                    115:                return 0;
                    116:        if (str_head.s_forw == 0)
                    117:                str_head.s_forw = str_head.s_back = &str_head;
                    118:        s->s_forw = str_head.s_forw;
                    119:        s->s_back = &str_head;
                    120:        str_head.s_forw = s;
                    121:        s->s_forw->s_back = s;
                    122:        return s->s_data;
                    123: }
                    124: 
                    125: str_free(str)
                    126: char *str;
                    127: {
                    128:        register struct string *s;
                    129: 
                    130:        for (s = str_head.s_forw; s != &str_head && s->s_data != str;
                    131:             s = s->s_forw)
                    132:                ;
                    133:        if (s == &str_head)
                    134:                abort();
                    135:        s->s_back->s_forw = s->s_forw;
                    136:        s->s_forw->s_back = s->s_back;
                    137:        free((char *)s);
                    138: }
                    139: #endif

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