snac2

commit d5b86e4e68c1121d0375544a4c389a88075cce30
parent 4b355fb2c96af2565c48bd47b87f51ab72192085
Author: Santtu Lakkala <santtu.lakkala@unikie.com>
Date:   Sat,  8 Feb 2025 12:28:15 +0200

Optimise xs_readline

Diffstat:
M
xs_io.h
 | 
24
+++++++++++-------------

1 file changed, 11 insertions(+), 13 deletions(-)
diff --git a/xs_io.h b/xs_io.h
@@ -14,24 +14,22 @@ xs_val *xs_readall(FILE *f);
 xs_str *xs_readline(FILE *f)
 /* reads a line from a file */
 {
-    xs_str *s = xs_str_new(NULL);
+    size_t sz = 128;
+    size_t i = 0;
+    char *s = xs_realloc(NULL, sz);
+    int c;
 
     errno = 0;
 
     /* don't even try on eof */
-    if (!feof(f)) {
-        int c;
-
-        while ((c = fgetc(f)) != EOF) {
-            unsigned char rc = c;
-
-            if (xs_is_string((char *)&rc))
-                s = xs_append_m(s, (char *)&rc, 1);
-
-            if (c == '\n')
-                break;
-        }
+    while ((c = fgetc(f)) != EOF && c != '\n') {
+        if (!xs_is_string(&(char){ c }))
+            continue;
+        if (i == sz - 1)
+            s = xs_realloc(s, sz *= 2);
+        s[i++] = c;
     }
+    s[i] = '\0';
 
     return s;
 }