1 files changed, 93 insertions, 0 deletions

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;
+}