nooc

commit dacb5b542397620ba34790d08a3975ad3561a3a9
parent 822a362cbf23c22df832f30672531fb3bd7adcc3
Author: Nihal Jere <nihal@nihaljere.xyz>
Date:   Tue,  2 Nov 2021 11:16:45 -0500

add syscall call

Diffstat:
M
main.c
 | 
27
++++++++++++++++++++++-----
M
prog.nc
 | 
4
++--

2 files changed, 24 insertions(+), 7 deletions(-)
diff --git a/main.c b/main.c
@@ -71,9 +71,14 @@ elf(char *text, size_t len, FILE *f)
 }
 
 enum tokentype {
-	TOK_EXIT = 1,
+	TOK_SYSCALL = 1,
+	TOK_EXIT,
+
 	TOK_LPAREN,
 	TOK_RPAREN,
+
+	TOK_COMMA,
+
 	TOK_NUM,
 };
 
@@ -103,8 +108,16 @@ lex(struct slice start)
 			continue;
 		} else if (strncmp(start.ptr, "exit", sizeof("exit") - 1) == 0) {
 			cur->type = TOK_EXIT;
-			start.ptr += 4;
-			start.len -= 4;
+			start.ptr += sizeof("exit") - 1;
+			start.len -= sizeof("exit") - 1;
+		} else if (strncmp(start.ptr, "syscall", sizeof("syscall") - 1) == 0) {
+			cur->type = TOK_SYSCALL;
+			start.ptr += sizeof("syscall") - 1;
+			start.len -= sizeof("syscall") - 1;
+		} else if (*start.ptr == ',') {
+			cur->type = TOK_COMMA;
+			start.ptr += 1;
+			start.len -= 1;
 		} else if (*start.ptr == '(') {
 			cur->type = TOK_LPAREN;
 			start.ptr += 1;
@@ -168,11 +181,15 @@ struct fcall
 parse(struct token *tok)
 {
 	struct fcall fcall;
-	expect(tok, TOK_EXIT);
+	expect(tok, TOK_SYSCALL);
+	tok = tok->next;
+	expect(tok, TOK_LPAREN);
+	tok = tok->next;
 
+	expect(tok, TOK_EXIT);
 	fcall.func = FUNC_EXIT;
 	tok = tok->next;
-	expect(tok, TOK_LPAREN);
+	expect(tok, TOK_COMMA);
 	tok = tok->next;
 	expect(tok, TOK_NUM);
 
diff --git a/prog.nc b/prog.nc
@@ -1 +1 @@
-	exit( 23 )-
\ No newline at end of file
+syscall(exit, 12)+
\ No newline at end of file