add env and make smash be able to parse files with comments

1 files changed, 81 insertions, 0 deletions

diff --git a/core/env.c b/core/env.c
new file mode 100644
index 0000000..e96be59
--- /dev/null
+++ b/core/env.c
@@ -0,0 +1,81 @@
+#include "../lib/io/io.h"
+#include "../lib/sys/sizes.h"
+#include "../lib/sys/execve.h"
+#include "../lib/env/env.h"
+
+#define BUFSIZ 1024
+char buf[BUFSIZ] = "";
+
+
+void add_to_env(char *line, u64 linenumber)
+{
+	char *key;
+	char *value;
+
+	key = line;
+
+	while (*line != '=' && *line) ++line;
+
+	if (!*line) {
+		wff(STDERR_FD, "error: %i no valid environment line\n", linenumber);
+		return;
+	}
+
+	*(line++) = 0;
+	value = line;
+
+	while (*line != '\n' && *line) ++line;
+
+	if (*line == '\n') *line = 0;
+
+	setenv(key, value);
+}
+
+
+int main(int argc, const char **argv)
+{
+	if (argc == 1) {
+		const char**envp = getenvp();
+		
+		while (*envp) {
+			wstdf("%s\n", *envp);
+			++envp;
+		}
+
+		return 0;
+	}
+
+	u64 fd = STDIN_FD;
+	u64 size;
+	char *p;
+	u64 linenumber = 1;
+	const char **execargv = argv + 1;
+
+	if (argv[1][0] == '-' && argv[1][1] == 'f') {
+		if (argc > 3) {
+			fd = open(argv[2], OPEN_READ_ONLY, 0);
+			if (fd < 0) {
+				wff(STDERR_FD, "venv: cannot open file '%s'\n", argv[2]);
+				return -1;
+			}
+			execargv = argv + 3;
+		} else {
+			wf(STDERR_FD, "venv [-f file] command [args...]\n");
+			return -1;
+		}
+	}
+
+	while ((size = read(fd, buf, BUFSIZ - 1))) {
+		p = buf;
+
+		while (p < buf + BUFSIZ && *p != '\n') ++p;
+		*(++p) = 0;
+
+		add_to_env(buf, linenumber++);
+	}
+
+	execve(execargv[0], execargv, getenvp());
+
+	wff(STDERR_FD, "cannot execute '%s'\n", execargv[0]);
+	return -1;
+}