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120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/*
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!!DESCRIPTION!! print word frequencies; uses structures
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!!ORIGIN!! LCC 4.1 Testsuite
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!!LICENCE!! own, freely distributeable for non-profit. read CPYRIGHT.LCC
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#define MAXWORDS 250
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FILE *in;
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#define getchar() fgetc(in)
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struct node
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{
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int count; /* frequency count */
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struct node *left; /* left subtree */
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struct node *right; /* right subtree */
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char *word; /* word itself */
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} words[MAXWORDS];
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int next; /* index of next free entry in words */
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/*struct node *lookup();*/
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int err(char *s);
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int getword(char *buf);
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void tprint(struct node *tree);
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struct node *lookup(char *word, struct node **p);
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int isletter(char c);
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/* err - print error message s and die */
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err(s) char *s; {
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printf("? %s\n", s);
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exit(EXIT_FAILURE);
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}
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/* getword - get next input word into buf, return 0 on EOF */
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int getword(buf) char *buf;
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{
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char *s;
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int c;
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while (((c = getchar()) != -1) && (isletter(c) == 0))
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;
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for (s = buf; (c = isletter(c)); c = getchar())
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*s++ = c;
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*s = 0;
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if (s > buf)
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return 1;
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return 0;
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}
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/* isletter - return folded version of c if it is a letter, 0 otherwise */
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int isletter(char c)
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{
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if ((c >= 'A') && (c <= 'Z')) c += 'a' - 'A';
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if ((c >= 'a') && (c <= 'z')) return c;
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return 0;
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}
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/* lookup - lookup word in tree; install if necessary */
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struct node *lookup(word, p)
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char *word; struct node **p;
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{
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int cond;
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/* char *malloc(); */
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if (*p) {
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cond = strcmp(word, (*p)->word);
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if (cond < 0)
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return lookup(word, &(*p)->left);
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else if (cond > 0)
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return lookup(word, &(*p)->right);
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else
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return *p;
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}
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if (next >= MAXWORDS)
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err("out of node storage");
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words[next].count = 0;
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words[next].left = words[next].right = 0;
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words[next].word = malloc(strlen(word) + 1);
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if (words[next].word == 0)
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err("out of word storage");
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strcpy(words[next].word, word);
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return *p = &words[next++];
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}
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/* tprint - print tree */
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void tprint(tree) struct node *tree; {
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if (tree) {
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tprint(tree->left);
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printf("%d:%s\n", tree->count, tree->word);
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tprint(tree->right);
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}
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}
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int main(void)
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{
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struct node *root;
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char word[20];
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in = fopen("wf1.in","rb");
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if (in == NULL) {
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return EXIT_FAILURE;
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}
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root = 0;
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next = 0;
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while (getword(word))
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lookup(word, &root)->count++;
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tprint(root);
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fclose(in);
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return 0;
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}
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