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 #include <time.h>
   7
   8 typedef struct expectation {
   9   time_t a, b;
  10   const char *message;
  11 } ex_t;
  12
  13 const ex_t END = {((time_t)-1), ((time_t)-1), NULL};
  14 static int is_end(ex_t exp) {
  15   return exp.a == END.a && exp.b == END.b && exp.message == END.message;
  16 }
  17 static ex_t expectation(time_t a, time_t b, const char *message) {
  18   ex_t exp;
  19   exp.a = a;
  20   exp.b = b;
  21   exp.message = message;
  22   return exp;
  23 }
  24
  25 static void die(const char *message) {
  26   fputs(message, stderr);
  27   fputc('\n', stderr);
  28   exit(1);
  29 }
  30
  31 static void die_err(const char *message) {
  32   perror(message);
  33   exit(1);
  34 }
  35
  36 static void remove_logfile() {
  37   if (remove("tl.log") != 0) {
  38     if (errno != ENOENT) {
  39       die_err("Error removing log file");
  40     }
  41   }
  42 }
  43
  44 static ex_t write_to_tl_append(const char *content) {
  45   FILE *p = popen("./tl-append", "w");
  46   if (p == NULL)
  47     die_err("Couldn't run tl-append");
  48   if (fputs(content, p) == EOF)
  49     die("Couldn't write to pipe");
  50   int status = pclose(p);
  51   if (status < 0)
  52     die_err("Error closing pipe");
  53   if (status != 0)
  54     die("tl-append exited abnormally");
  55   return expectation((time_t)-1, ((time_t)-1), content);
  56 }
  57
  58 static void verify_log_contents(ex_t exps[]) {
  59
  60   FILE *f = fopen("tl.log", "r");
  61   if (f == NULL)
  62     die_err("Error opening log file");
  63   for (size_t i = 0; !is_end(exps[i]); i++) {
  64     size_t len = strlen(exps[i].message);
  65     char *buf = (char *)malloc(len + 2);
  66     if (fgets(buf, len + 1, f) == NULL)
  67       die("Error reading log file");
  68     if (ferror(f))
  69       die("Error reading log file");
  70     if (strncmp(exps[i].message, buf, len + 1) != 0)
  71       die("Wrong contents in log file");
  72     free(buf);
  73   }
  74   if (fclose(f) != 0)
  75     die_err("Error closing log file");
  76 }
  77
  78 static void write_and_read_line() {
  79   remove_logfile();
  80   ex_t e = write_to_tl_append("foo\n");
  81   verify_log_contents((ex_t[]){e, END});
  82 }
  83
  84 static void write_and_read_two_lines() {
  85   remove_logfile();
  86   ex_t e1 = write_to_tl_append("foo\n");
  87   ex_t e2 = write_to_tl_append("bar\n");
  88   verify_log_contents((ex_t[]){e1, e2, END});
  89 }
  90
  91 int main() {
  92   write_and_read_line();
  93   write_and_read_two_lines();
  94 }