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main.c
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main.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv)
{
// Run main loop stuff
char *line;
char **args;
int status;
do {
printf("> ");
line = lsh_read_line();
args = lsh_split_line(line);
status = lsh_execute(args);
free(line);
free(args);
} while (status);
return EXIT_SUCCESS;
}
#define LSH_RL_BUFSIZE 1024
char *lsh_read_line(void)
{
char *line = NULL;
int bufsize = 0; // have getline allocate a buffer for us
if (getline(&line, &bufsize, stdin) == -1){
if (feof(stdin)) {
exit(EXIT_SUCCESS); // We recieved an EOF
} else {
perror("readline");
exit(EXIT_FAILURE);
}
}
return line;
}
#define LSH_TOK_BUFSIZE 64
#define LSH_TOK_DELIM " \t\r\n\a"
char **lsh_split_line(char *line)
{
int bufsize = LSH_TOK_BUFSIZE, position = 0;
char **tokens = malloc(bufsize * sizeof(char*));
char *token;
if (!tokens) {
fprintf(stderr, "lsh: allocation error\n");
exit(EXIT_FAILURE);
}
token = strtok(line, LSH_TOK_DELIM);
while (token != NULL) {
tokens[position] = token;
position++;
if (position >= bufsize) {
bufsize += LSH_TOK_BUFSIZE;
tokens = realloc(tokens, bufsize * sizeof(char*));
if (!tokens) {
fprintf(stderr, "lsh: allocation error\n");
exit(EXIT_FAILURE);
}
}
token = strtok(NULL, LSH_TOK_DELIM);
}
tokens[position] = NULL;
return tokens;
}