path: root/sort.c

#include "sort.h"

int main(void) {
    vec *lines;
    unsigned long i;
    char *line;

    lines = vec_init();

    while ((line = read_line(stdin)) != NULL) {
        vec_add(lines, line);
    }
    free(line);

    qsort(lines->data, lines->count, sizeof(char *), qsort_strcmp);

    for (i = 0; i < lines->count; i++) {
        fputs(lines->data[i], stdout);
    }
    vec_free(lines);

    exit(EXIT_SUCCESS);
}

char *read_line(FILE* stream) {
    char *buf;
    char *line;
    unsigned long line_length;
    unsigned long line_size;

    line_size = BUF_SIZE;
    line = malloc(line_size * sizeof(char *));
    strncpy(line, "", 1);

    buf = malloc(BUF_SIZE);
    for (;;) {
        if (fgets(buf, BUF_SIZE, stream) == NULL) {
            free(buf);
            free(line);
            return NULL;
        }
        line = strncat(line, buf, BUF_SIZE);
        line_length = strlen(line);
        if (line[line_length - 1] == '\n') {
            free(buf);
            return line;
        } else {
            line_size <<= 1;
            line = realloc(line, line_size * sizeof(char *));
        }
    }
}

vec *vec_init(void) {
    vec *v;
    v = malloc(sizeof(vec));
    v->count = 0;
    v->size = VEC_SIZE;
    v->data = malloc(v->size * sizeof(char *));
    return v;
}

void vec_add(vec *v, char *s) {
    if (v->count == v->size) {
        v->size <<= 1;
        v->data = realloc(v->data, v->size * sizeof(char *));
    }
    v->data[v->count++] = s;
    return;
}

void vec_free(vec *v) {
    unsigned long i;
    for (i = 0; i < v->count; i++) {
        free(v->data[i]);
    }
    free(v->data);
    free(v);
    return;
}

static int qsort_strcmp(const void *p1, const void *p2) {
    return strcmp(* (char * const *) p1, * (char * const *) p2);
}