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#include "shell.h"
#include <stdbool.h>
#include <string.h>
static bool isspace(char c) {
return c == ' ' || c == '\t' || c == '\n';
}
static char skipspace(char **sp) {
char *s = *sp;
while (*s && isspace(*s)) s++;
*sp = s;
return *s;
}
static bool isspecial(char c) {
return c == '>' || c == '#';
}
static char *parg(char **sp) {
char *s = *sp;
char *res = NULL;
if (skipspace(&s)) {
// TODO incorrectly handles strings like a"b"
switch (*s) {
case '"':
s++;
res = s;
while (*s && *s != '"')
s++;
break;
default:
res = s;
while (*s && !isspace(*s) && !isspecial(*s))
s++;
if (*s == '#') {
*s = '\0'; /* end parsing early */
if (res == s) /* don't output an empty arg */
res = NULL;
}
break;
}
if (*s) *s++ = '\0';
}
*sp = s;
return res;
}
int parse(char *s, char **argv, size_t argvlen, struct redir *redir) {
if (argvlen == 0) return -1;
size_t argc = 0;
char *arg;
*argv = NULL;
redir->stdout = NULL;
redir->append = false;
while (skipspace(&s)) {
switch (*s) {
case '>':
s++;
if (*s == '>') {
s++;
redir->append = true;
}
redir->stdout = parg(&s);
break;
default:
arg = parg(&s);
argv[argc++] = arg;
if (argc >= argvlen)
return -1;
}
}
argv[argc] = NULL;
return argc;
}
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