strbuf.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include "strbuf.h"
   4
   5 void strbuf_init(struct strbuf *sb) {
   6         sb->buf = 0;
   7         sb->eof = sb->alloc = sb->len = 0;
   8 }
   9
  10 static void strbuf_begin(struct strbuf *sb) {
  11         free(sb->buf);
  12         strbuf_init(sb);
  13 }
  14
  15 static void inline strbuf_add(struct strbuf *sb, int ch) {
  16         if (sb->alloc <= sb->len) {
  17                 sb->alloc = sb->alloc * 3 / 2 + 16;
  18                 sb->buf = realloc(sb->buf, sb->alloc);
  19         }
  20         sb->buf[sb->len++] = ch;
  21 }
  22
  23 static void strbuf_end(struct strbuf *sb) {
  24         strbuf_add(sb, 0);
  25 }
  26
  27 void read_line(struct strbuf *sb, FILE *fp, int term) {
  28         int ch;
  29         strbuf_begin(sb);
  30         if (feof(fp)) {
  31                 sb->eof = 1;
  32                 return;
  33         }
  34         while ((ch = fgetc(fp)) != EOF) {
  35                 if (ch == term)
  36                         break;
  37                 strbuf_add(sb, ch);
  38         }
  39         if (sb->len == 0)
  40                 sb->eof = 1;
  41         strbuf_end(sb);
  42 }
  43