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+
+/**
+ * \file streqvcmp.c
+ *
+ * String Equivalence Comparison
+ *
+ * These routines allow any character to be mapped to any other
+ * character before comparison. In processing long option names,
+ * the characters "-", "_" and "^" all need to be equivalent
+ * (because they are treated so by different development environments).
+ *
+ * @addtogroup autoopts
+ * @{
+ */
+/*
+ * This file is part of AutoOpts, a companion to AutoGen.
+ * AutoOpts is free software.
+ * AutoOpts is Copyright (C) 1992-2014 by Bruce Korb - all rights reserved
+ *
+ * AutoOpts is available under any one of two licenses. The license
+ * in use must be one of these two and the choice is under the control
+ * of the user of the license.
+ *
+ * The GNU Lesser General Public License, version 3 or later
+ * See the files "COPYING.lgplv3" and "COPYING.gplv3"
+ *
+ * The Modified Berkeley Software Distribution License
+ * See the file "COPYING.mbsd"
+ *
+ * These files have the following sha256 sums:
+ *
+ * 8584710e9b04216a394078dc156b781d0b47e1729104d666658aecef8ee32e95 COPYING.gplv3
+ * 4379e7444a0e2ce2b12dd6f5a52a27a4d02d39d247901d3285c88cf0d37f477b COPYING.lgplv3
+ * 13aa749a5b0a454917a944ed8fffc530b784f5ead522b1aacaf4ec8aa55a6239 COPYING.mbsd
+ *
+ * This array is designed for mapping upper and lower case letter
+ * together for a case independent comparison. The mappings are
+ * based upon ascii character sequences.
+ */
+static unsigned char charmap[] = {
+ NUL, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, '\a',
+ '\b', '\t', NL, '\v', '\f', '\r', 0x0E, 0x0F,
+ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+ 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
+
+ ' ', '!', '"', '#', '$', '%', '&', '\'',
+ '(', ')', '*', '+', ',', '-', '.', '/',
+ '0', '1', '2', '3', '4', '5', '6', '7',
+ '8', '9', ':', ';', '<', '=', '>', '?',
+
+ '@', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
+ 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
+ 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
+ 'x', 'y', 'z', '[', '\\', ']', '^', '_',
+ '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
+ 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
+ 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
+ 'x', 'y', 'z', '{', '|', '}', '~', 0x7f,
+
+ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+ 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
+ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
+ 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
+ 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
+ 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
+ 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7,
+ 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
+
+ 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
+ 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
+ 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
+ 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
+ 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
+ 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
+ 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
+ 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF,
+};
+
+
+/*=export_func strneqvcmp
+ *
+ * what: compare two strings with an equivalence mapping
+ *
+ * arg: + char const* + str1 + first string +
+ * arg: + char const* + str2 + second string +
+ * arg: + int + ct + compare length +
+ *
+ * ret_type: int
+ * ret_desc: the difference between two differing characters
+ *
+ * doc:
+ *
+ * Using a character mapping, two strings are compared for "equivalence".
+ * Each input character is mapped to a comparison character and the
+ * mapped-to characters are compared for the two NUL terminated input strings.
+ * The comparison is limited to @code{ct} bytes.
+ * This function name is mapped to option_strneqvcmp so as to not conflict
+ * with the POSIX name space.
+ *
+ * err: none checked. Caller responsible for seg faults.
+=*/
+int
+strneqvcmp(char const * s1, char const * s2, int ct)
+{
+ for (; ct > 0; --ct) {
+ unsigned char u1 = (unsigned char) *s1++;
+ unsigned char u2 = (unsigned char) *s2++;
+ int dif;
+ if (u1 == u2) {
+ if (u1 == NUL)
+ return 0;
+ continue;
+ }
+
+ dif = charmap[ u1 ] - charmap[ u2 ];
+
+ if (dif != 0)
+ return dif;
+
+ if (u1 == NUL)
+ return 0;
+ }
+
+ return 0;
+}
+
+
+/*=export_func streqvcmp
+ *
+ * what: compare two strings with an equivalence mapping
+ *
+ * arg: + char const* + str1 + first string +
+ * arg: + char const* + str2 + second string +
+ *
+ * ret_type: int
+ * ret_desc: the difference between two differing characters
+ *
+ * doc:
+ *
+ * Using a character mapping, two strings are compared for "equivalence".
+ * Each input character is mapped to a comparison character and the
+ * mapped-to characters are compared for the two NUL terminated input strings.
+ * This function name is mapped to option_streqvcmp so as to not conflict
+ * with the POSIX name space.
+ *
+ * err: none checked. Caller responsible for seg faults.
+=*/
+int
+streqvcmp(char const * s1, char const * s2)
+{
+ for (;;) {
+ unsigned char u1 = (unsigned char) *s1++;
+ unsigned char u2 = (unsigned char) *s2++;
+ int dif;
+ if (u1 == u2) {
+ if (u1 == NUL)
+ return 0;
+ continue;
+ }
+
+ dif = charmap[ u1 ] - charmap[ u2 ];
+
+ if (dif != 0)
+ return dif;
+
+ if (u1 == NUL)
+ return 0;
+ }
+}
+
+
+/*=export_func streqvmap
+ *
+ * what: Set the character mappings for the streqv functions
+ *
+ * arg: + char + from + Input character +
+ * arg: + char + to + Mapped-to character +
+ * arg: + int + ct + compare length +
+ *
+ * doc:
+ *
+ * Set the character mapping. If the count (@code{ct}) is set to zero, then
+ * the map is cleared by setting all entries in the map to their index
+ * value. Otherwise, the "@code{From}" character is mapped to the "@code{To}"
+ * character. If @code{ct} is greater than 1, then @code{From} and @code{To}
+ * are incremented and the process repeated until @code{ct} entries have been
+ * set. For example,
+ * @example
+ * streqvmap('a', 'A', 26);
+ * @end example
+ * @noindent
+ * will alter the mapping so that all English lower case letters
+ * will map to upper case.
+ *
+ * This function name is mapped to option_streqvmap so as to not conflict
+ * with the POSIX name space.
+ *
+ * err: none.
+=*/
+void
+streqvmap(char from, char to, int ct)
+{
+ if (ct == 0) {
+ ct = sizeof(charmap) - 1;
+ do {
+ charmap[ct] = (unsigned char)ct;
+ } while (--ct >= 0);
+ }
+
+ else {
+ unsigned int i_to = (int)to & 0xFF;
+ unsigned int i_from = (int)from & 0xFF;
+
+ do {
+ charmap[i_from] = (unsigned char)i_to;
+ i_from++;
+ i_to++;
+ if ((i_from >= sizeof(charmap)) || (i_to >= sizeof(charmap)))
+ break;
+ } while (--ct > 0);
+ }
+}
+
+
+/*=export_func strequate
+ *
+ * what: map a list of characters to the same value
+ *
+ * arg: + char const* + ch_list + characters to equivalence +
+ *
+ * doc:
+ *
+ * Each character in the input string get mapped to the first character
+ * in the string.
+ * This function name is mapped to option_strequate so as to not conflict
+ * with the POSIX name space.
+ *
+ * err: none.
+=*/
+void
+strequate(char const* s)
+{
+ if ((s != NULL) && (*s != NUL)) {
+ unsigned char equiv = (unsigned char)*s;
+ while (*s != NUL)
+ charmap[(unsigned char)*(s++)] = equiv;
+ }
+}
+
+
+/*=export_func strtransform
+ *
+ * what: convert a string into its mapped-to value
+ *
+ * arg: + char* + dest + output string +
+ * arg: + char const* + src + input string +
+ *
+ * doc:
+ *
+ * Each character in the input string is mapped and the mapped-to
+ * character is put into the output.
+ * This function name is mapped to option_strtransform so as to not conflict
+ * with the POSIX name space.
+ *
+ * The source and destination may be the same.
+ *
+ * err: none.
+=*/
+void
+strtransform(char* d, char const* s)
+{
+ do {
+ *(d++) = (char)charmap[(unsigned char)*s];
+ } while (*(s++) != NUL);
+}
+
+/** @}
+ *
+ * Local Variables:
+ * mode: C
+ * c-file-style: "stroustrup"
+ * indent-tabs-mode: nil
+ * End:
+ * end of autoopts/streqvcmp.c */
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