File: letterize.c

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letterize 1.4-1
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/*
 * letterize.c -- generate all mnemonics corresponding to a phone number
 *
 * by Eric S. Raymond <esr@snark.thyrsus.com>, Oct 24 1994
 *
 * Everything between the CUT HEREs was copied from a code fragment I found
 * on the net, unattributed.
 *
 * ------------------------------ CUT HERE -----------------------------------
 */
/*
		Table of triple usage in text

		24511 words were used to make this table.
		The words came from the files:
			/usr/dict/words
			obvpats.lp

		The table is 30 percent populated.
*/
static long obvtab[27][27] =
{
    {	0X00100001, 0X00040000, 0X00040000, 0X00009000, 0X00808020, 0X00140000, 
	0X00000000, 0X00080000, 0X00000002, 0X00000000, 0X00000000, 0X00000000, 
	0X00001020, 0X00000000, 0X00000010, 0X00000020, 0X00000000, 0X00000000, 
	0X00000030, 0X00300100, 0X00000100, 0X00000000, 0X00000020, 0X00000000, 
	0X00000000, 0X00000000, 0X00000000 },
    {	0X00090000, 0X000c708a, 0X022cd73e, 0X023ffbbe, 0X02fffffe, 0X002cd0da, 
	0X023cdae2, 0X02adf3b6, 0X0024f222, 0X00dd7efa, 0X00008022, 0X02b5937a, 
	0X06fdfbfe, 0X02bdf37e, 0X07ffdfff, 0X003c3248, 0X023dfb76, 0X00200000, 
	0X07fffffe, 0X02bbfbbe, 0X06bcfb6f, 0X055f7dfc, 0X02609232, 0X021cfbf6, 
	0X02999222, 0X00bdf3ff, 0X06308232 },
    {	0X00080000, 0X07fdfbfc, 0X022c9226, 0X00008012, 0X00248222, 0X07dffbfe, 
	0X00200000, 0X00000000, 0X00208020, 0X047ffdfe, 0X00000020, 0X00000000, 
	0X02208222, 0X00800220, 0X0000a022, 0X03fdfffe, 0X00048000, 0X00000000, 
	0X02208222, 0X00308228, 0X00049062, 0X071efefc, 0X00000220, 0X00000020, 
	0X00000000, 0X049d11a2, 0X00000000 },
    {	0X00080080, 0X02fffffe, 0X000c0020, 0X0024932a, 0X0000802a, 0X06bdf3fe, 
	0X00000002, 0X00248220, 0X02bdf3fe, 0X007df0fe, 0X00000000, 0X02bdfffe, 
	0X02208222, 0X00200222, 0X00008222, 0X07fffffe, 0X00000102, 0X00200000, 
	0X02308222, 0X00188200, 0X02aca262, 0X003df27e, 0X00000004, 0X00000000, 
	0X00000000, 0X001dd08e, 0X00000022 },
    {	0X00088022, 0X06fd7bfc, 0X02249222, 0X00209102, 0X02249332, 0X07fff7fe, 
	0X00249282, 0X02a43a22, 0X00008222, 0X05fdf3fe, 0X00208022, 0X00000220, 
	0X02208222, 0X00208222, 0X00008223, 0X07fdf3fe, 0X00049322, 0X00200000, 
	0X02208222, 0X0091bb2a, 0X00008302, 0X043dfafe, 0X00008222, 0X02048222, 
	0X00000000, 0X00987aef, 0X00200000 },
    {	0X004c1030, 0X04ff79dc, 0X023c9226, 0X023c9b3a, 0X02bdf3fe, 0X04ddfbfe, 
	0X023c92fa, 0X0224f3e6, 0X0224a222, 0X045d7afa, 0X00208022, 0X0218ca36, 
	0X02fdfbfe, 0X02a9f22e, 0X06ffffff, 0X05fd73d8, 0X02bdb32e, 0X00200000, 
	0X07fffffe, 0X02fbfbbe, 0X06bdfb6e, 0X005d78bc, 0X066c8222, 0X029df37e, 
	0X0333832a, 0X008df97f, 0X06648222 },
    {	0X00080000, 0X07bc7bfe, 0X00000222, 0X0000000a, 0X00008002, 0X02fc7abe, 
	0X022cb366, 0X00000102, 0X00000022, 0X055c70fe, 0X00008000, 0X00000002, 
	0X02208222, 0X0000000a, 0X00000200, 0X03edf2be, 0X00000008, 0X00000000, 
	0X02208222, 0X00118922, 0X028ca32e, 0X041c74b8, 0X00000000, 0X00000002, 
	0X00000000, 0X00000000, 0X00000000 },
    {	0X00080000, 0X06fdf3fc, 0X00008222, 0X00000000, 0X00008022, 0X02fdf3fe, 
	0X00240220, 0X020d93a2, 0X02bddffe, 0X047df0fe, 0X00000002, 0X00008200, 
	0X02208222, 0X02300222, 0X00318226, 0X02fdf3fe, 0X00009220, 0X00000000, 
	0X02208222, 0X00919b06, 0X00048302, 0X061cf2ee, 0X00000000, 0X02048022, 
	0X00000000, 0X00056002, 0X00000002 },
    {	0X00080000, 0X06fdfbfe, 0X02249222, 0X00048102, 0X00048202, 0X07fff2ff, 
	0X00208202, 0X00008022, 0X00008122, 0X047dfcfe, 0X00000800, 0X00008220, 
	0X02248222, 0X0008a222, 0X0028c222, 0X06fdfeff, 0X00209202, 0X00200000, 
	0X02249232, 0X00108302, 0X02bdf3fa, 0X071d71fe, 0X00000200, 0X00008322, 
	0X00000000, 0X011d32be, 0X00000000 },
    {	0X00483010, 0X05dd7bbc, 0X022cf226, 0X023cdb2a, 0X02bdf6b6, 0X04fd79fc, 
	0X0234d262, 0X063df3a2, 0X00000222, 0X00000202, 0X00208002, 0X02208a22, 
	0X02fdbbfe, 0X022df36e, 0X07ffffff, 0X05fd70be, 0X02bdb766, 0X00200000, 
	0X02fdfafe, 0X02ffffff, 0X06bdfb6f, 0X000c7008, 0X02248222, 0X00008202, 
	0X023082e2, 0X00000002, 0X04608022 },
    {	0X00080000, 0X07ed7bbc, 0X00000000, 0X00000000, 0X00000000, 0X009cd57a, 
	0X00000000, 0X00000000, 0X00000000, 0X005070c4, 0X00000400, 0X00001000, 
	0X00000000, 0X00000000, 0X00000000, 0X02fc5bae, 0X00000000, 0X00000000, 
	0X00000000, 0X00000000, 0X00000000, 0X015d7e96, 0X00000000, 0X00000000, 
	0X00000000, 0X00000000, 0X00000000 },
    {	0X00080000, 0X07fdfff4, 0X00248222, 0X00040302, 0X00048022, 0X02fdf3f6, 
	0X00208222, 0X00048000, 0X0014a022, 0X00ddf8fe, 0X00000002, 0X0000ca22, 
	0X0220a222, 0X00000022, 0X00208222, 0X01fdfb7a, 0X00009202, 0X00000000, 
	0X02208222, 0X02b1abae, 0X00048302, 0X029d7110, 0X00000000, 0X00008322, 
	0X00000000, 0X00ac9522, 0X00000000 },
    {	0X00088000, 0X07fffbfe, 0X02249222, 0X0234b322, 0X02bdf36e, 0X07fdfffe, 
	0X00bc93e6, 0X00048222, 0X00008222, 0X05fffdfe, 0X00008000, 0X0288d322, 
	0X02bdb7fe, 0X0228e332, 0X00208020, 0X07fffffe, 0X021ca362, 0X00000000, 
	0X02208022, 0X0299ab26, 0X06eca326, 0X055dfefe, 0X00008222, 0X02008322, 
	0X00000000, 0X00bdfbfe, 0X00000022 },
    {	0X00080000, 0X07fdffbc, 0X002dd236, 0X0021fbfe, 0X00008020, 0X07ddfbfe, 
	0X00209220, 0X00000000, 0X00208020, 0X053efcfa, 0X00000000, 0X00000000, 
	0X00008222, 0X0220a222, 0X02208222, 0X07fdfbfe, 0X023c9be6, 0X00200000, 
	0X00088002, 0X0239a37c, 0X00048120, 0X041dfaf8, 0X00000020, 0X00008222, 
	0X00000000, 0X001cd0a8, 0X00000000 },
    {	0X00180000, 0X06fdfbfe, 0X002c922a, 0X02349b22, 0X02bffffe, 0X07fff3ff, 
	0X00249222, 0X02bdbb76, 0X02208222, 0X057ffbfe, 0X00208022, 0X021d33ea, 
	0X02008222, 0X00008222, 0X0228c222, 0X07fdf2fe, 0X00209220, 0X00200000, 
	0X0220822a, 0X02fdfbfe, 0X06adf3ee, 0X043dfafe, 0X02208222, 0X00048322, 
	0X00100200, 0X01ffb11e, 0X02808222 },
    {	0X0008113c, 0X017f79da, 0X02fcd77e, 0X02349b2a, 0X02adfbfe, 0X037ef35c, 
	0X0234b262, 0X02bcf7f6, 0X0204f222, 0X011c58fe, 0X00008222, 0X02a99b2e, 
	0X06fdfbfe, 0X02aff36e, 0X07ffffff, 0X045df9dc, 0X02bffbae, 0X00200000, 
	0X06fffbfe, 0X02fbbbae, 0X02bdf3ee, 0X055f73ff, 0X02008a22, 0X06bdfb7e, 
	0X02d043ea, 0X001dd37e, 0X06008222 },
    {	0X00080000, 0X07fffabc, 0X002c9022, 0X00008100, 0X00040002, 0X07fdfefe, 
	0X00241220, 0X00040002, 0X023cd232, 0X057ff8fa, 0X00000002, 0X00000220, 
	0X02208222, 0X00208022, 0X00008020, 0X03fdfafa, 0X022db322, 0X00040000, 
	0X02208222, 0X02b0bb2a, 0X0224832a, 0X041d7afe, 0X00000008, 0X00048202, 
	0X00000000, 0X00949b86, 0X00000000 },
    {	0X00080000, 0X00100000, 0X00000000, 0X00000000, 0X00000000, 0X00000010, 
	0X00000000, 0X00000000, 0X00000000, 0X00000000, 0X00000000, 0X00000000, 
	0X00000000, 0X00000000, 0X00000000, 0X00000000, 0X00000000, 0X00020000, 
	0X00080000, 0X00000000, 0X00000000, 0X02008222, 0X00000000, 0X00000020, 
	0X00000000, 0X00000000, 0X00000000 },
    {	0X00080010, 0X07fffffc, 0X022c9222, 0X023c9b2a, 0X02bdd366, 0X07ffffff, 
	0X00249222, 0X022cb322, 0X02208222, 0X07fbfdfe, 0X00208020, 0X029df336, 
	0X02b98236, 0X0239936e, 0X02b9ab66, 0X07fffffe, 0X023cb322, 0X00200000, 
	0X02248322, 0X02f3fb7e, 0X06bcf3ee, 0X01ddf2fe, 0X02208222, 0X00008222, 
	0X00000020, 0X0099f0be, 0X00008222 },
    {	0X00081000, 0X03fdfffe, 0X02248222, 0X0224b323, 0X00248242, 0X07fffbfe, 
	0X02208222, 0X002c8220, 0X02f5fa6e, 0X057ff8fe, 0X00200000, 0X0224a222, 
	0X02208222, 0X02208222, 0X02208223, 0X06f5f7fe, 0X022c9326, 0X00200000, 
	0X00288222, 0X02bdf36e, 0X02edf7ff, 0X041df2fe, 0X00010220, 0X00248222, 
	0X00000000, 0X001d78bc, 0X00000000 },
    {	0X001c1010, 0X03fdfbfc, 0X00248222, 0X02249102, 0X00048000, 0X03fdfbfe, 
	0X00249222, 0X00248022, 0X02bffbfe, 0X047ff8fe, 0X00000000, 0X02000222, 
	0X02208222, 0X00208222, 0X00308223, 0X07fdfafe, 0X00049222, 0X00000000, 
	0X02a08222, 0X02f1ab7e, 0X027c9be2, 0X031df2fe, 0X00000202, 0X01208322, 
	0X00000000, 0X01ad328e, 0X000db2a2 },
    {	0X004c1010, 0X02dd7bdc, 0X027db736, 0X023c9b2a, 0X06ac92b6, 0X063df5f6, 
	0X0030b042, 0X002cf3a2, 0X00004002, 0X057dd0be, 0X00208202, 0X00048a30, 
	0X06fdfafe, 0X007bf36e, 0X02bdfbfe, 0X023d5210, 0X02bdbbfe, 0X00200000, 
	0X06fffbfe, 0X023bdbbe, 0X06bcf3be, 0X00202000, 0X00840220, 0X00000002, 
	0X00309220, 0X00601022, 0X04208022 },
    {	0X00080000, 0X003d7fbc, 0X00004000, 0X00000000, 0X00000002, 0X039dfbfe, 
	0X00000000, 0X00000000, 0X00000000, 0X057cdafe, 0X00000000, 0X00000100, 
	0X00008002, 0X00000000, 0X00000000, 0X02bcfa88, 0X00000000, 0X00000000, 
	0X00008020, 0X00000800, 0X00000000, 0X000c1000, 0X02400220, 0X01000000, 
	0X00000000, 0X00800200, 0X00008000 },
    {	0X00080000, 0X077d7bde, 0X00248222, 0X00208102, 0X02248220, 0X025d53bf, 
	0X00209202, 0X00000200, 0X02208222, 0X055d70f8, 0X00000000, 0X02804200, 
	0X02180222, 0X00000222, 0X02bd03fc, 0X00fdf864, 0X00209222, 0X00000000, 
	0X02008222, 0X02bdbb2c, 0X00208322, 0X00057100, 0X00000000, 0X00808002, 
	0X02000000, 0X0000f022, 0X02000000 },
    {	0X00080000, 0X005870d8, 0X00000000, 0X00649322, 0X00000000, 0X021c7298, 
	0X00008000, 0X00201000, 0X00208202, 0X0058f0fe, 0X00000000, 0X00000000, 
	0X00000020, 0X00000000, 0X00000002, 0X001d6090, 0X00249222, 0X00200000, 
	0X00000000, 0X00000020, 0X02248326, 0X00051016, 0X00000200, 0X00008020, 
	0X01008000, 0X04041080, 0X00000000 },
    {	0X004c1010, 0X0097f998, 0X00248232, 0X00009322, 0X0004c226, 0X00ddf0f6, 
	0X00201222, 0X0224f230, 0X02048020, 0X00094030, 0X00000002, 0X00004420, 
	0X00699a22, 0X0221e22e, 0X0310c3ba, 0X04fd78d8, 0X023dd322, 0X00200000, 
	0X0234c272, 0X0039b32e, 0X02108322, 0X00095b88, 0X00000022, 0X0004832a, 
	0X00000200, 0X02000000, 0X00000002 },
    {	0X00080000, 0X00557b8e, 0X00000000, 0X00000000, 0X00000002, 0X00bc5a3e, 
	0X00000000, 0X00000020, 0X00000000, 0X003df0ae, 0X00000000, 0X00000000, 
	0X02008020, 0X00000002, 0X00000000, 0X0065e2b2, 0X00000002, 0X00000000, 
	0X00008002, 0X00000008, 0X00000020, 0X00040820, 0X00008020, 0X00008020, 
	0X00000008, 0X00002084, 0X06809222 } };
/*
	Configuration parameters
*/
static short unusual;				/* count of unusual triples */

/*
	dotriple  --  called by obvword

	If this triple is not used by any word used to build the table,
	we tally that fact.
*/
void dotriple(short m1, short m2, short m3)
/* all args in in 0..25 */
{
    if (!(obvtab[m1][m2] & (1L << m3))) unusual++; /* check for triple */
}

/*
 * ------------------------------ CUT HERE -----------------------------------
 */

#include <stdio.h>
#include <stdbool.h>

/*
	obvword  --  do one word

	dotriple is called on each 3-character triple in the word,
	using a mapped value of the character into the range 0..26,
	where letters map into 1..26 regardless of case and everything
	else maps to zero.
*/
static bool obvword(char word[])
{
    register int i;		/* for loops */
    register int patcnt = 0;	/* count in word */
    register char ch;		/* working char */
    short pat[21];		/* pattern of mapped values */

    unusual = 0;
    for (i=0; word[i] && (i < sizeof(pat)); i++)	/* scan until null */
    { 	
	patcnt = i;		/* max value */
	ch = word[i];		/* get character */
	if ((ch >= 'a') && (ch <= 'z')) pat[i] = ch + 1 - 'a';
	else if ((ch >= 'A') && (ch <= 'Z')) pat[i] = ch + 1 - 'A';
	else pat[i] = 0;		/* map into 0..26 */
    }
    for (i=0; i < patcnt - 1; i++)	/* for all triples */
	dotriple(pat[i], pat[i+1], pat[i+2]); /* do the triple */
    return(unusual == 0);
}

void phone_gen(char *s, int i)
/* print out all trailing substrings of s that satify obvword() */
{
    static char *digitrans[]
	= { "abc", "def", "ghi", "jkl", "mno", "prs", "tuv", "wxy" };

    char c, *s2;
	
    c = s[i];

    if (c == '\0')
    {
	if (obvword(s))
	    (void) printf("%s\n", s);
    }
    else if ('2' <= c && c <= '9')
	for (s2 = digitrans[c-'2'];  s[i]= *s2++;)
	    phone_gen(s, i+1);
    else
	phone_gen(s, i+1);

    s[i] = c;
}

main(int argc, char **argv)
{
    for (;  --argc > 0;  printf("\n"))
	phone_gen(*++argv, 0);

    return(0);
}

/* letterize.c ends here */