commit 7432b0a64761aa07f95ad19761c61bf11db428e9
parent e80252a52bf25f762bc986ce6e4e0d17fbb130d0
Author: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date: Mon, 27 Feb 2017 11:14:32 -0500
fix int parsing
The spec says that numbers can be arbitrarily
big, and only the last 64 bits will be taken
into consideration. Calling sscanf does not
implement this, so I wrote an ad-hoc function.
Diffstat:
| M | parse.c | | | 26 | ++++++++++++++++++++++++-- |
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/parse.c b/parse.c
@@ -254,6 +254,29 @@ lexinit()
done = 1;
}
+static int64_t
+getint()
+{
+ uint64_t n;
+ int c, m;
+
+ n = 0;
+ c = fgetc(inf);
+ m = 0;
+ switch (c) {
+ case '-': m = 1;
+ case '+': c = fgetc(inf);
+ }
+ do {
+ n = 10*n + (c - '0');
+ c = fgetc(inf);
+ } while ('0' <= c && c <= '9');
+ ungetc(c, inf);
+ if (m)
+ n = 1 + ~n;
+ return *(int64_t *)&n;
+}
+
static int
lex()
{
@@ -312,8 +335,7 @@ lex()
}
if (isdigit(c) || c == '-' || c == '+') {
ungetc(c, inf);
- if (fscanf(inf, "%"SCNd64, &tokval.num) != 1)
- err("invalid integer literal");
+ tokval.num = getint();
return Tint;
}
if (c == '"') {
