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#include "parser.h"
#include "../lib/malloc/malloc.h"
#include "../lib/cstr/cstr.h"
#include "../lib/sys/write.h"
char **__new_argv(char *exp);
void __free_argv(char **argv);
expression_list_t *new_expression_from_line(char *line)
{
u64 n = cstr_split(line, '|');
char *current = line;
char *next = 0;
expression_list_t *head = 0;
expression_list_t *expression = 0;
for (; n > 0; --n) {
next = (char*)next_split(current);
strip_cstr(current, ' ');
if (!expression) {
expression = malloc(sizeof(expression_list_t));
head = expression;
} else {
expression->next = malloc(sizeof(expression_list_t));
expression = expression->next;
}
expression->call = current;
expression->next = 0;
current = next;
}
return head;
}
void free_expression(expression_list_t *expression)
{
expression_list_t *next;
while (expression) {
next = expression->next;
free(expression);
expression = next;
}
}
char **__new_argv(char *exp)
{
u64 n = cstr_split(exp, ' ');
char **argv = malloc(sizeof(char*) * n + 1);
u64 i = 0;
char *current = exp;
char *next;
for (; n > 0; --n) {
next = (char*)next_split(current);
strip_cstr(current, ' ');
if (cstr_length(current))
argv[i++] = current;
current = next;
}
argv[i] = 0;
return argv;
}
void __free_argv(char **argv)
{
free(argv);
}
#ifdef PARSER_UNIT_TEST
#include "../lib/sys/execve.h"
#include "../lib/sys/fork.h"
#include "../lib/sys/wait4.h"
#include "../lib/sys/pipe.h"
#include "../lib/sys/dup2.h"
#include "../lib/sys/close.h"
#include "../lib/sys/io.h"
#include "../lib/sys/exit.h"
int main() {
char in[] = "/bin/ls -a | /bin/wc -l";
expression_list_t *exps = new_expression_from_line(in);
expression_list_t *exp = exps;
char **envp = { 0 };
int pid[2];
int pipefd[2];
char **argv1 = __new_argv(exp->call);
char **argv2 = __new_argv(exp->next->call);
pipe(pipefd);
pid[0] = fork();
if (pid[0] == 0) {
close(pipefd[0]);
dup2(pipefd[1], STDOUT_FD);
close(pipefd[1]);
execve(argv1[0], argv1, envp);
} else {
pid[1] = fork();
close(pipefd[1]);
if (pid[1] == 0) {
dup2(pipefd[0], STDIN_FD);
close(pipefd[0]);
execve(argv2[0], argv2, envp);
} else {
close(pipefd[0]);
wait4(pid[0], 0, 0);
wait4(pid[1], 0, 0);
}
}
return 0;
}
#endif
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