git.scottworley.com Git - tl-append/blob - tl-append-test.c

   1 #define _POSIX_C_SOURCE 2
   2 #include <errno.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6
   7 struct expectation {
   8   const char *message;
   9 };
  10
  11 const struct expectation END = {NULL};
  12 static struct expectation expectation(const char *message) {
  13   struct expectation exp;
  14   exp.message = message;
  15   return exp;
  16 }
  17
  18 static void die(const char *message) {
  19   fputs(message, stderr);
  20   fputc('\n', stderr);
  21   exit(1);
  22 }
  23
  24 static void die_err(const char *message) {
  25   perror(message);
  26   exit(1);
  27 }
  28
  29 static void remove_logfile() {
  30   if (remove("tl.log") != 0) {
  31     if (errno != ENOENT) {
  32       die_err("Error removing log file");
  33     }
  34   }
  35 }
  36
  37 static struct expectation write_to_tl_append(const char *content) {
  38   FILE *p = popen("./tl-append", "w");
  39   if (p == NULL)
  40     die_err("Couldn't run tl-append");
  41   if (fputs(content, p) == EOF)
  42     die("Couldn't write to pipe");
  43   int status = pclose(p);
  44   if (status < 0)
  45     die_err("Error closing pipe");
  46   if (status != 0)
  47     die("tl-append exited abnormally");
  48   return expectation(content);
  49 }
  50
  51 static void verify_log_contents(const char *contents) {
  52   size_t len = strlen(contents);
  53   char *buf = (char *)malloc(len + 2);
  54
  55   FILE *f = fopen("tl.log", "r");
  56   if (f == NULL)
  57     die_err("Error opening log file");
  58   buf[fread(buf, 1, len + 1, f)] = '\0';
  59   if (ferror(f))
  60     die("Error reading log file");
  61   if (strncmp(contents, buf, len + 1) != 0)
  62     die("Wrong contents in log file");
  63   if (fclose(f) != 0)
  64     die_err("Error closing log file");
  65   free(buf);
  66 }
  67
  68 static void write_and_read_line() {
  69   remove_logfile();
  70   write_to_tl_append("foo\n");
  71   verify_log_contents("foo\n");
  72 }
  73
  74 static void write_and_read_two_lines() {
  75   remove_logfile();
  76   write_to_tl_append("foo\n");
  77   write_to_tl_append("bar\n");
  78   verify_log_contents("foo\nbar\n");
  79 }
  80
  81 int main() {
  82   write_and_read_line();
  83   write_and_read_two_lines();
  84 }