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remove_char_unit_test.c
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290 lines (216 loc) · 5.71 KB
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#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/types.h>
/* Specifies the number of unit tests */
#define N_UNIT_TESTS 5
/* The maxium length of the YAML output string */
#define MAX_YAML_LEN 1024
/* The indentation in spaces in the yaml string */
#define INDENT 4
/* File descriptors for stdin and stdout */
#define IN 0
#define OUT 1
/*start_prototype*/
void remove_char(char c, char *str){
/* Your C program goes here */
}
/*end_prototype*/
/* Pipe used to communicate with each forked process */
int pipe_des[2];
/* Used to ditch when something goes wrong */
void quitif(int err){
if (-1 == err){
perror("error");
exit(1);
}
}
/* Used to build a yaml string */
struct yaml_string{
char yaml[MAX_YAML_LEN];
int write;
};
struct yaml_string * create_yaml(){
struct yaml_string * y;
y = calloc(sizeof(struct yaml_string), sizeof(char));
y->write = 0;
return y;
}
void append_line(struct yaml_string * s, char * str, int indent){
int i;
int len = strlen(str);
if (s->write + len > MAX_YAML_LEN)
return;
indent = indent < 0 ? 0 : indent;
for (i = 0 ; i < indent ; i++)
s->yaml[s->write++] = ' ';
for (i = 0 ; i < len ; i++)
s->yaml[s->write++] = str[i];
s->yaml[s->write++] = '\n';
}
void flush_yaml(struct yaml_string * ys){
int i, bytes_written;
bytes_written = write(pipe_des[OUT], ys->yaml, ys->write);
quitif(bytes_written);
for (i = ys->write - 1 ; i ; i--)
ys->yaml[i] = '\0';
ys->write = 0;
}
void print_test_info(struct yaml_string * ys,
char * name,
char * input,
char * expected,
char * points){
char test_name[256];
sprintf(test_name, "%s:", name);
append_line(ys, test_name, 0);
append_line(ys, "input: |", INDENT);
append_line(ys, input, INDENT * 2);
append_line(ys, "expected: |", INDENT);
append_line(ys, expected, INDENT * 2);
append_line(ys, "points: |", INDENT);
append_line(ys, points, INDENT * 2);
flush_yaml(ys);
}
void print_test_output(struct yaml_string * ys, char * str){
append_line(ys, "output: |", INDENT);
append_line(ys, str, INDENT * 2);
flush_yaml(ys);
}
void test_first_char(){
char str[128] = "abcd";
struct yaml_string * ys = create_yaml();
print_test_info(ys, "test_first_char", "a abcd", "bcd", "20");
remove_char('a', str);
str[sizeof(str) - 1] = '\0';
print_test_output(ys, str);
}
void test_last_char(){
char str[128] = "abcde";
struct yaml_string * ys = create_yaml();
print_test_info(ys, "test_last_char", "e abcde", "abcd", "20");
remove_char('e', str);
str[ sizeof(str) - 1] = '\0';
print_test_output(ys, str);
}
void test_3(){
char str[128] = "abcde";
struct yaml_string * ys = create_yaml();
print_test_info(ys, "test_3", "e abcde", "abcd", "20");
remove_char('e', str);
str[ sizeof(str) - 1] = '\0';
print_test_output(ys, str);
}
void test_4(){
char str[128] = "abcde";
struct yaml_string * ys = create_yaml();
print_test_info(ys, "test_4", "e abcde", "abcd", "20");
remove_char('e', str);
str[ sizeof(str) - 1] = '\0';
print_test_output(ys, str);
}
void test_5(){
char str[128] = "abcde";
struct yaml_string * ys = create_yaml();
print_test_info(ys, "test_5", "e abcde", "abcd", "20");
remove_char('e', str);
str[ sizeof(str) - 1] = '\0';
print_test_output(ys, str);
}
void print_results(){
int bytes_read, err;
char buff[MAX_YAML_LEN] = "";
bytes_read = read(pipe_des[IN], buff, MAX_YAML_LEN);
quitif(bytes_read);
err = close(pipe_des[IN]);
quitif(err);
err = write(OUT, buff, bytes_read);
quitif(err);
}
void err_handler(int sig){
int i;
char arith_err[128] = "";
char mem_err[128] = "";
char sys_err[128] = "";
char indent[128] = "";
for (i = 0 ; i < INDENT ; i++)
indent[i] = ' ';
sprintf(arith_err, "%s%s", indent, "error: arithmetic\n");
sprintf(mem_err, "%s%s", indent, "error: memory\n");
sprintf(sys_err, "%s%s", indent, "error: memory\n");
switch (sig){
case SIGFPE:
write(pipe_des[OUT], arith_err, strlen(arith_err));
break;
case SIGBUS:
write(pipe_des[OUT], mem_err, strlen(mem_err));
break;
case SIGSEGV:
write(pipe_des[OUT], mem_err, strlen(mem_err));
break;
case SIGSYS:
write(pipe_des[OUT], sys_err, strlen(sys_err));
break;
case SIGILL:
write(pipe_des[OUT], mem_err, strlen(mem_err));
break;
}
raise(sig);
}
void handle_signals(){
struct sigaction act;
sigemptyset(&act.sa_mask);
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESETHAND;
act.sa_handler = err_handler;
sigaction(SIGFPE, &act, NULL);
sigaction(SIGBUS, &act, NULL);
sigaction(SIGSEGV, &act, NULL);
sigaction(SIGSYS, &act, NULL);
sigaction(SIGILL, &act, NULL);
sigaction(SIGSYS, &act, NULL);
}
void run_tests(){
int err;
pid_t stat;
/* Each of the test functions will be called in its own fork */
void (** unit_test) (void);
void (* test_fns[N_UNIT_TESTS + 1]) (void) =
{test_first_char,
test_last_char,
test_3,
test_4,
test_5, NULL};
for (unit_test = test_fns ; *unit_test ; unit_test++){
err = pipe(pipe_des);
quitif(err);
switch (fork()){
case -1:
quitif(-1);
break;
/* Execute the unit test in the child */
case 0:
close(pipe_des[IN]);
handle_signals();
(*unit_test)();
err = close(pipe_des[OUT]);
quitif(err);
exit(0);
break;
/* Wait for the child to finish the unit test */
default:
close(pipe_des[OUT]);
err = wait(&stat);
quitif(err);
print_results();
break;
}
}
}
int main(){
run_tests();
return 0;
}