| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame^] | 1 | /* $NetBSD: aliasname.c,v 1.2 2005/02/09 21:35:46 kleink Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c)2002 YAMAMOTO Takashi,
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | *
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| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 26 | * SUCH DAMAGE.
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| 27 | */
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| 28 | #include <LibConfig.h>
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| 29 | #include <sys/EfiCdefs.h>
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| 30 | #if defined(LIBC_SCCS) && !defined(lint)
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| 31 | __RCSID("$NetBSD: aliasname.c,v 1.2 2005/02/09 21:35:46 kleink Exp $");
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| 32 | #endif /* LIBC_SCCS and not lint */
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| 33 |
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| 34 | #include "namespace.h"
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| 35 | #include <assert.h>
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| 36 | #include <stdio.h>
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| 37 | #include <string.h>
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| 38 |
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| 39 | #include "aliasname_local.h"
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| 40 |
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| 41 | __inline int __is_ws(char);
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| 42 |
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| 43 | __inline int __is_ws(char ch)
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| 44 | {
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| 45 |
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| 46 | return (ch == ' ' || ch == '\t');
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| 47 | }
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| 48 |
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| 49 | const char *
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| 50 | __unaliasname(const char *dbname, const char *alias, void *buf, size_t bufsize)
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| 51 | {
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| 52 | FILE *fp = NULL;
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| 53 | const char *result = alias;
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| 54 | size_t resultlen;
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| 55 | size_t aliaslen;
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| 56 | const char *p;
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| 57 | size_t len;
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| 58 |
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| 59 | _DIAGASSERT(dbname != NULL);
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| 60 | _DIAGASSERT(alias != NULL);
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| 61 | _DIAGASSERT(buf != NULL);
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| 62 |
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| 63 | fp = fopen(dbname, "r");
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| 64 | if (fp == NULL)
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| 65 | goto quit;
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| 66 |
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| 67 | aliaslen = strlen(alias);
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| 68 |
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| 69 | while (/*CONSTCOND*/ 1) {
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| 70 | p = fgetln(fp, &len);
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| 71 | if (p == NULL)
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| 72 | goto quit; /* eof or error */
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| 73 |
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| 74 | _DIAGASSERT(len != 0);
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| 75 |
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| 76 | /* ignore terminating NL */
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| 77 | if (p[len - 1] == '\n')
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| 78 | len--;
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| 79 |
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| 80 | /* ignore null line and comment */
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| 81 | if (len == 0 || p[0] == '#')
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| 82 | continue;
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| 83 |
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| 84 | if (aliaslen > len)
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| 85 | continue;
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| 86 |
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| 87 | if (memcmp(alias, p, aliaslen))
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| 88 | continue;
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| 89 |
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| 90 | p += aliaslen;
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| 91 | len -= aliaslen;
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| 92 |
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| 93 | if (len == 0 || !__is_ws(*p))
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| 94 | continue;
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| 95 |
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| 96 | /* entry was found here */
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| 97 | break;
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| 98 |
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| 99 | /* NOTREACHED */
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| 100 | }
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| 101 |
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| 102 | /* skip white spaces */
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| 103 | do {
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| 104 | p++;
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| 105 | len--;
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| 106 | } while (len != 0 && __is_ws(*p));
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| 107 |
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| 108 | if (len == 0)
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| 109 | goto quit;
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| 110 |
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| 111 | /* count length of result */
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| 112 | resultlen = 0;
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| 113 | while (resultlen < len && !__is_ws(*p))
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| 114 | resultlen++;
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| 115 |
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| 116 | /* check if space is enough */
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| 117 | if (bufsize < resultlen + 1)
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| 118 | goto quit;
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| 119 |
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| 120 | memcpy(buf, p, resultlen);
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| 121 | ((char *)buf)[resultlen] = 0;
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| 122 | result = buf;
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| 123 |
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| 124 | quit:
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| 125 | if (fp)
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| 126 | fclose(fp);
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| 127 |
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| 128 | return result;
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| 129 | }
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