From 3568412f8f230774d0d11d7ed1c897424f95d3ef Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano.tronto@gmail.com>
Date: Thu, 11 Nov 2021 21:37:34 +0100
Subject: Rewritten from scratch. Welocme nissy 2.0!

---
 src/shell.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 src/shell.c

(limited to 'src/shell.c')

diff --git a/src/shell.c b/src/shell.c
new file mode 100644
index 0000000..0880f8a
--- /dev/null
+++ b/src/shell.c
@@ -0,0 +1,93 @@
+#include "shell.h"
+
+static void             cleanwhitespaces(char *line);
+static int              parseline(char *line, char **v);
+
+static void
+cleanwhitespaces(char *line)
+{
+	char *i;
+
+	for (i = line; *i != 0; i++)
+		if (*i == '\t' || *i == '\n')
+			*i = ' ';
+}
+
+/* This function assumes that **v is large enough */
+static int
+parseline(char *line, char **v)
+{
+	char *t;
+	int n = 0;
+	
+	cleanwhitespaces(line);
+
+	for (t = strtok(line, " "); t != NULL; t = strtok(NULL, " "))
+		strcpy(v[n++], t);
+
+	return n;
+}
+
+void
+exec_args(int c, char **v)
+{
+	int i;
+	Command *cmd = NULL;
+	CommandArgs *args;
+
+	for (i = 0; i < NCOMMANDS; i++)
+		if (commands[i] != NULL && !strcmp(v[0], commands[i]->name))
+			cmd = commands[i];
+
+	if (cmd == NULL) {
+		fprintf(stderr, "%s: command not found\n", v[0]);
+		return;
+	}
+
+	args = cmd->parse_args(c-1, &v[1]);
+	if (!args->success) {
+		fprintf(stderr, "usage: %s\n", cmd->usage);
+		return;
+	}
+
+	cmd->exec(args);
+	free_args(args);
+}
+
+void
+launch()
+{
+	int i, shell_argc;
+	char line[MAXLINELEN], **shell_argv;
+
+	shell_argv = malloc(MAXNTOKENS * sizeof(char *));
+	for (i = 0; i < MAXNTOKENS; i++)
+		shell_argv[i] = malloc((MAXTOKENLEN+1) * sizeof(char));
+
+	fprintf(stderr, "Welcome to Nissy "VERSION".\n");
+	fprintf(stderr, "Type 'help' for a list.\n");
+
+	while (true) {
+		fprintf(stderr, "nissy-# ");
+		if (fgets(line, MAXLINELEN, stdin) == NULL)
+			break;
+		shell_argc = parseline(line, shell_argv);
+		if (shell_argc > 0)
+			exec_args(shell_argc, shell_argv);
+	}
+
+	for (i = 0; i < MAXNTOKENS; i++)
+		free(shell_argv[i]);
+	free(shell_argv);
+}
+
+int
+main(int argc, char *argv[])
+{
+	if (argc > 1)
+		exec_args(argc-1, &argv[1]);
+	else
+		launch();
+
+	return 0;
+}
-- 
cgit v1.3