99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
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// vim: set ts=4 sw=4 et tw=80:
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#include <stdio.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdbool.h>
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#define MAX_LINE_SIZE 1001
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#define DEBUG
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void swap(char** a, char** b);
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void print_words(char* words[], size_t start, size_t end);
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void quicksort_string(char* strings[static 1], size_t start, size_t end);
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void swap(char** a, char** b) {
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char* tmp;
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tmp = *a;
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*a = *b;
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*b = tmp;
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}
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void quicksort_string(char* strings[static 1], size_t start, size_t end) {
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#ifdef DEBUG
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sleep(1);
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printf("%ld - %ld: ", start, end);
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print_words(strings, start, end);
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putchar('\n');
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#endif
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if (end - start <= 2) {
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#ifdef DEBUG
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puts("returning");
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#endif
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return;
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}
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char* pivot = strings[end - 1];
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size_t i, gt = end - 1;
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for (i = start; i < gt; i++) {
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#ifdef DEBUG
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printf("i=%ld gt=%ld\n", i, gt);
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print_words(strings, start, end);
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putchar('\n');
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#endif
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if (strcmp(strings[i], pivot) > 0) {
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swap(&strings[--gt], &strings[i--]);
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}
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}
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swap(&strings[gt], &strings[end - 1]);
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#ifdef DEBUG
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print_words(strings, start, gt);
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printf("| %s | ", strings[gt]);
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print_words(strings, gt + 1, end);
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putchar('\n');
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#endif
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quicksort_string(strings, start, gt);
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quicksort_string(strings, gt + 1, end);
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}
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void print_words(char* words[], size_t start, size_t end) {
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size_t i;
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for (i = start; i < end; i++) {
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printf("%s ", words[i] == NULL ? "NULL" : words[i]);
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}
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}
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int main() {
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char line[MAX_LINE_SIZE];
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char* words[MAX_LINE_SIZE / 2];
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char* word = line;
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size_t chars = 0, words_len = 0;
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int c;
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bool last_alpha = false;
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while ((c = getchar()) != EOF) {
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if (!isalpha(c) || c == '\n') {
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if (last_alpha) {
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line[chars++] = '\0';
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words[words_len++] = word;
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word = line + chars;
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last_alpha = false;
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}
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if (c == '\n') {
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quicksort_string(words, 0, words_len);
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print_words(words, 0, words_len);
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putchar('\n');
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chars = 0;
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words_len = 0;
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word = line;
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}
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} else {
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line[chars++] = c;
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last_alpha = true;
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}
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}
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}
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