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90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
/*****************************************************************************/
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/* soundex.c */
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/*****************************************************************************/
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#include <string.h>
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#include <stdio.h>
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#include "postgres.h" /* for char16, etc. */
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#include "utils/palloc.h" /* for palloc */
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#include "libpq-fe.h" /* for TUPLE */
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#include <stdio.h>
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#include <ctype.h>
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/* prototype for soundex function */
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char *soundex(char *instr, char *outstr);
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text *
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text_soundex(text *t)
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{
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/* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
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char *table = "01230120022455012623010202";
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int count = 0;
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text *new_t;
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char outstr[6 + 1]; /* max length of soundex is 6 */
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char *instr;
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/* make a null-terminated string */
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instr = palloc(VARSIZE(t) + 1);
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memcpy(instr, VARDATA(t), VARSIZE(t) - VARHDRSZ);
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instr[VARSIZE(t) - VARHDRSZ] = (char) 0;
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/* load soundex into outstr */
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soundex(instr, outstr);
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/* Now the outstr contains the soundex of instr */
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/* copy outstr to new_t */
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new_t = (text *) palloc(strlen(outstr) + VARHDRSZ);
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memset(new_t, 0, strlen(outstr) + 1);
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VARSIZE(new_t) = strlen(outstr) + VARHDRSZ;
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memcpy((void *) VARDATA(new_t),
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(void *) outstr,
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strlen(outstr));
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/* free instr */
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pfree(instr);
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return (new_t);
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}
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char *
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soundex(char *instr, char *outstr)
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{ /* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
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char *table = "01230120022455012623010202";
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int count = 0;
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while (!isalpha(instr[0]) && instr[0])
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++instr;
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if (!instr[0])
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{ /* Hey! Where'd the string go? */
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outstr[0] = (char) 0;
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return outstr;
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}
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if (toupper(instr[0]) == 'P' && toupper(instr[1]) == 'H')
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{
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instr[0] = 'F';
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instr[1] = 'A';
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}
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*outstr++ = (char) toupper(*instr++);
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while (*instr && count < 5)
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{
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if (isalpha(*instr) && *instr != *(instr - 1))
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{
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*outstr = table[toupper(instr[0]) - 'A'];
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if (*outstr != '0')
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{
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++outstr;
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++count;
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}
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}
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++instr;
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}
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*outstr = '\0';
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return (outstr);
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}
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