159 lines
2.6 KiB
C
Executable File
159 lines
2.6 KiB
C
Executable File
/* look 1.3 - Find lines in a sorted list. Author: Kees J. Bot
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*/
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#define nil 0
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#include <sys/types.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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char DEFAULT[] = "/usr/lib/dict/words";
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char *string, *wordlist= DEFAULT;
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#define MAXLEN 1024 /* Maximum word length. */
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int dflg= 0, fflg= 0;
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void nonascii(char *what)
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{
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fprintf(stderr, "look: %s contains non-ASCII characters.\n", what);
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exit(1);
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}
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int compare(char *prefix, char *word)
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{
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char *p= prefix, *w= word;
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int cp, cw;
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do {
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do {
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if ((cp= *p++) == 0) return 0;
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if (!isascii(cp)) nonascii("prefix string");
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} while (dflg && !isspace(cp) && !isalnum(cp));
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if (dflg) {
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if (isspace(cp)) {
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while (isspace(*p)) p++;
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cp= ' ';
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}
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}
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if (fflg && isupper(cp)) cp= tolower(cp);
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do {
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if ((cw= *w++) == 0) return 1;
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if (!isascii(cw)) nonascii(wordlist);
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} while (dflg && !isspace(cw) && !isalnum(cw));
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if (dflg) {
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if (isspace(cw)) {
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while (isspace(*w)) w++;
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cw= ' ';
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}
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}
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if (fflg && isupper(cw)) cw= tolower(cw);
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} while (cp == cw);
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return cp - cw;
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}
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char *readword(FILE *f)
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{
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static char word[MAXLEN + 2];
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int n;
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if (fgets(word, sizeof(word), f) == nil) {
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if (ferror(f)) {
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fprintf(stderr, "look: read error on %s",
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wordlist);
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exit(1);
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}
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return nil;
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}
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n= strlen(word);
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if (word[n-1] != '\n') {
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fprintf(stderr, "look: word from %s is too long\n", wordlist);
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exit(1);
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}
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word[n-1] = 0;
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return word;
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}
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void look(void)
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{
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off_t low, mid, high;
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FILE *f;
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char *word;
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int c;
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if ((f= fopen(wordlist, "r")) == nil) {
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fprintf(stderr, "look: Can't open %s\n", wordlist);
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exit(1);
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}
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low= 0;
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fseek(f, (off_t) 0, 2);
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high= ftell(f);
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while (low <= high) {
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mid= (low + high) / 2;
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fseek(f, mid, 0);
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if (mid != 0) readword(f);
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if ((word= readword(f)) == nil)
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c= -1;
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else
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c= compare(string, word);
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if (c <= 0) high= mid - 1; else low= mid + 1;
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}
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fseek(f, low, 0);
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if (low != 0) readword(f);
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c=0;
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while (c >= 0 && (word= readword(f)) != nil) {
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c= compare(string, word);
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if (c == 0) puts(word);
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}
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}
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int main(int argc, char **argv)
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{
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if (argc == 2) dflg= fflg= 1;
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while (argc > 1 && argv[1][0] == '-') {
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char *p= argv[1] + 1;
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while (*p != 0) {
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switch (*p++) {
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case 'd': dflg= 1; break;
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case 'f': fflg= 1; break;
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default:
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fprintf(stderr, "look: Bad flag: %c\n", p[-1]);
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exit(1);
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}
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}
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argc--;
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argv++;
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}
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if (argc == 3)
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wordlist= argv[2];
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else
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if (argc != 2) {
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fprintf(stderr, "Usage: look [-df] string [file]\n");
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exit(1);
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}
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string= argv[1];
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look();
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exit(0);
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}
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/* Kees J. Bot 24-5-89. */
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