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 typedef struct expectation {
   8   const char *message;
   9 } ex_t;
  10
  11 const ex_t END = {NULL};
  12 static int is_end(ex_t exp) { return exp.message == END.message; }
  13 static ex_t expectation(const char *message) {
  14   ex_t exp;
  15   exp.message = message;
  16   return exp;
  17 }
  18
  19 static void die(const char *message) {
  20   fputs(message, stderr);
  21   fputc('\n', stderr);
  22   exit(1);
  23 }
  24
  25 static void die_err(const char *message) {
  26   perror(message);
  27   exit(1);
  28 }
  29
  30 static void remove_logfile() {
  31   if (remove("tl.log") != 0) {
  32     if (errno != ENOENT) {
  33       die_err("Error removing log file");
  34     }
  35   }
  36 }
  37
  38 static ex_t write_to_tl_append(const char *content) {
  39   FILE *p = popen("./tl-append", "w");
  40   if (p == NULL)
  41     die_err("Couldn't run tl-append");
  42   if (fputs(content, p) == EOF)
  43     die("Couldn't write to pipe");
  44   int status = pclose(p);
  45   if (status < 0)
  46     die_err("Error closing pipe");
  47   if (status != 0)
  48     die("tl-append exited abnormally");
  49   return expectation(content);
  50 }
  51
  52 static void verify_log_contents(ex_t exps[]) {
  53
  54   FILE *f = fopen("tl.log", "r");
  55   if (f == NULL)
  56     die_err("Error opening log file");
  57   for (size_t i = 0; !is_end(exps[i]); i++) {
  58     size_t len = strlen(exps[i].message);
  59     char *buf = (char *)malloc(len + 2);
  60     if (fgets(buf, len + 1, f) == NULL)
  61       die("Error reading log file");
  62     if (ferror(f))
  63       die("Error reading log file");
  64     if (strncmp(exps[i].message, buf, len + 1) != 0)
  65       die("Wrong contents in log file");
  66     free(buf);
  67   }
  68   if (fclose(f) != 0)
  69     die_err("Error closing log file");
  70 }
  71
  72 static void write_and_read_line() {
  73   remove_logfile();
  74   ex_t e = write_to_tl_append("foo\n");
  75   verify_log_contents((ex_t[]){e, END});
  76 }
  77
  78 static void write_and_read_two_lines() {
  79   remove_logfile();
  80   ex_t e1 = write_to_tl_append("foo\n");
  81   ex_t e2 = write_to_tl_append("bar\n");
  82   verify_log_contents((ex_t[]){e1, e2, END});
  83 }
  84
  85 int main() {
  86   write_and_read_line();
  87   write_and_read_two_lines();
  88 }