#include <stdio.h>
#include <stdlib.h>
#include "strbuf.h"

void strbuf_init(struct strbuf *sb) {
        sb->buf = 0;
        sb->eof = sb->alloc = sb->len = 0;
}

static void strbuf_begin(struct strbuf *sb) {
        free(sb->buf);
        strbuf_init(sb);
}

static void inline strbuf_add(struct strbuf *sb, int ch) {
        if (sb->alloc <= sb->len) {
                sb->alloc = sb->alloc * 3 / 2 + 16;
                sb->buf = realloc(sb->buf, sb->alloc);
        }
        sb->buf[sb->len++] = ch;
}

static void strbuf_end(struct strbuf *sb) {
        strbuf_add(sb, 0);
}

void read_line(struct strbuf *sb, FILE *fp, int term) {
        int ch;
        strbuf_begin(sb);
        if (feof(fp)) {
                sb->eof = 1;
                return;
        }
        while ((ch = fgetc(fp)) != EOF) {
                if (ch == term)
                        break;
                strbuf_add(sb, ch);
        }
        if (sb->len == 0)
                sb->eof = 1;
        strbuf_end(sb);
}