276da39af9
Approved by: roberto, delphij Security: VuXML: 0d0f3050-1f69-11e5-9ba9-d050996490d0 Security: http://bugs.ntp.org/show_bug.cgi?id=2853 Security: https://www.kb.cert.org/vuls/id/668167 Security: http://support.ntp.org/bin/view/Main/SecurityNotice#June_2015_NTP_Security_Vulnerabi
285 lines
8.1 KiB
C
285 lines
8.1 KiB
C
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/**
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* \file streqvcmp.c
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*
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* String Equivalence Comparison
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*
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* These routines allow any character to be mapped to any other
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* character before comparison. In processing long option names,
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* the characters "-", "_" and "^" all need to be equivalent
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* (because they are treated so by different development environments).
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*
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* @addtogroup autoopts
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* @{
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*/
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/*
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* This file is part of AutoOpts, a companion to AutoGen.
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* AutoOpts is free software.
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* AutoOpts is Copyright (C) 1992-2015 by Bruce Korb - all rights reserved
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*
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* AutoOpts is available under any one of two licenses. The license
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* in use must be one of these two and the choice is under the control
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* of the user of the license.
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*
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* The GNU Lesser General Public License, version 3 or later
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* See the files "COPYING.lgplv3" and "COPYING.gplv3"
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*
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* The Modified Berkeley Software Distribution License
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* See the file "COPYING.mbsd"
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*
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* These files have the following sha256 sums:
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*
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* 8584710e9b04216a394078dc156b781d0b47e1729104d666658aecef8ee32e95 COPYING.gplv3
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* 4379e7444a0e2ce2b12dd6f5a52a27a4d02d39d247901d3285c88cf0d37f477b COPYING.lgplv3
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* 13aa749a5b0a454917a944ed8fffc530b784f5ead522b1aacaf4ec8aa55a6239 COPYING.mbsd
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*
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* This array is designed for mapping upper and lower case letter
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* together for a case independent comparison. The mappings are
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* based upon ascii character sequences.
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*/
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static unsigned char charmap[] = {
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NUL, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, '\a',
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'\b', '\t', NL, '\v', '\f', '\r', 0x0E, 0x0F,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
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' ', '!', '"', '#', '$', '%', '&', '\'',
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'(', ')', '*', '+', ',', '-', '.', '/',
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', ':', ';', '<', '=', '>', '?',
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'@', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
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'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
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'x', 'y', 'z', '[', '\\', ']', '^', '_',
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'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
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'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
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'x', 'y', 'z', '{', '|', '}', '~', 0x7f,
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0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
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0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
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0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
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0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
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0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
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0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7,
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0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
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0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
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0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
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0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
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0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
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0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
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0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
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0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
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0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF,
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};
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/*=export_func strneqvcmp
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*
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* what: compare two strings with an equivalence mapping
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*
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* arg: + char const * + str1 + first string +
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* arg: + char const * + str2 + second string +
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* arg: + int + ct + compare length +
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*
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* ret_type: int
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* ret_desc: the difference between two differing characters
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*
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* doc:
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*
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* Using a character mapping, two strings are compared for "equivalence".
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* Each input character is mapped to a comparison character and the
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* mapped-to characters are compared for the two NUL terminated input strings.
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* The comparison is limited to @code{ct} bytes.
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* This function name is mapped to option_strneqvcmp so as to not conflict
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* with the POSIX name space.
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*
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* err: none checked. Caller responsible for seg faults.
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=*/
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int
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strneqvcmp(char const * s1, char const * s2, int ct)
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{
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for (; ct > 0; --ct) {
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unsigned char u1 = (unsigned char) *s1++;
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unsigned char u2 = (unsigned char) *s2++;
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int dif;
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if (u1 == u2) {
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if (u1 == NUL)
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return 0;
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continue;
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}
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dif = charmap[ u1 ] - charmap[ u2 ];
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if (dif != 0)
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return dif;
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if (u1 == NUL)
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return 0;
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}
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return 0;
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}
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/*=export_func streqvcmp
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*
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* what: compare two strings with an equivalence mapping
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*
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* arg: + char const * + str1 + first string +
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* arg: + char const * + str2 + second string +
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*
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* ret_type: int
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* ret_desc: the difference between two differing characters
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*
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* doc:
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*
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* Using a character mapping, two strings are compared for "equivalence".
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* Each input character is mapped to a comparison character and the
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* mapped-to characters are compared for the two NUL terminated input strings.
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* This function name is mapped to option_streqvcmp so as to not conflict
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* with the POSIX name space.
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*
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* err: none checked. Caller responsible for seg faults.
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=*/
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int
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streqvcmp(char const * s1, char const * s2)
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{
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for (;;) {
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unsigned char u1 = (unsigned char) *s1++;
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unsigned char u2 = (unsigned char) *s2++;
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int dif;
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if (u1 == u2) {
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if (u1 == NUL)
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return 0;
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continue;
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}
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dif = charmap[ u1 ] - charmap[ u2 ];
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if (dif != 0)
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return dif;
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if (u1 == NUL)
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return 0;
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}
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}
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/*=export_func streqvmap
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*
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* what: Set the character mappings for the streqv functions
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*
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* arg: + char + from + Input character +
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* arg: + char + to + Mapped-to character +
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* arg: + int + ct + compare length +
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*
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* doc:
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*
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* Set the character mapping. If the count (@code{ct}) is set to zero, then
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* the map is cleared by setting all entries in the map to their index
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* value. Otherwise, the "@code{From}" character is mapped to the "@code{To}"
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* character. If @code{ct} is greater than 1, then @code{From} and @code{To}
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* are incremented and the process repeated until @code{ct} entries have been
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* set. For example,
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* @example
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* streqvmap('a', 'A', 26);
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* @end example
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* @noindent
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* will alter the mapping so that all English lower case letters
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* will map to upper case.
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*
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* This function name is mapped to option_streqvmap so as to not conflict
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* with the POSIX name space.
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*
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* err: none.
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=*/
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void
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streqvmap(char from, char to, int ct)
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{
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if (ct == 0) {
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ct = sizeof(charmap) - 1;
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do {
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charmap[ct] = (unsigned char)ct;
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} while (--ct >= 0);
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}
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else {
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unsigned int i_to = (int)to & 0xFF;
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unsigned int i_from = (int)from & 0xFF;
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do {
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charmap[i_from] = (unsigned char)i_to;
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i_from++;
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i_to++;
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if ((i_from >= sizeof(charmap)) || (i_to >= sizeof(charmap)))
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break;
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} while (--ct > 0);
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}
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}
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/*=export_func strequate
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*
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* what: map a list of characters to the same value
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*
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* arg: + char const * + ch_list + characters to equivalence +
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*
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* doc:
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*
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* Each character in the input string get mapped to the first character
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* in the string.
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* This function name is mapped to option_strequate so as to not conflict
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* with the POSIX name space.
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*
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* err: none.
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=*/
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void
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strequate(char const * s)
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{
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if ((s != NULL) && (*s != NUL)) {
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unsigned char equiv = (unsigned char)*s;
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while (*s != NUL)
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charmap[(unsigned char)*(s++)] = equiv;
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}
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}
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/*=export_func strtransform
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*
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* what: convert a string into its mapped-to value
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*
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* arg: + char * + dest + output string +
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* arg: + char const * + src + input string +
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*
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* doc:
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*
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* Each character in the input string is mapped and the mapped-to
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* character is put into the output.
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* This function name is mapped to option_strtransform so as to not conflict
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* with the POSIX name space.
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*
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* The source and destination may be the same.
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*
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* err: none.
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=*/
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void
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strtransform(char * d, char const * s)
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{
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do {
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*(d++) = (char)charmap[(unsigned char)*s];
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} while (*(s++) != NUL);
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}
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/** @}
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*
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* Local Variables:
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* mode: C
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* c-file-style: "stroustrup"
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* indent-tabs-mode: nil
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* End:
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* end of autoopts/streqvcmp.c */
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