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