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Fix scanf() %n off by one at eof

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Fixes #1094
This commit is contained in:
Justine Tunney 2024-01-20 15:06:16 -08:00
parent d50064a779
commit 39b0a9c03e
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GPG key ID: BE714B4575D6E328
2 changed files with 103 additions and 77 deletions
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10
libc/stdio/vcscanf.c
View file

@ -237,7 +237,8 @@ int __vcscanf(int callback(void *), //
case 'F': case 'F':
case 'g': case 'g':
case 'G': // floating point number case 'G': // floating point number
if (!(charbytes == sizeof(char) || charbytes == sizeof(wchar_t))) { if (!(charbytes == sizeof(char) ||
charbytes == sizeof(wchar_t))) {
items = -1; items = -1;
goto Done; goto Done;
} }
@ -361,7 +362,8 @@ int __vcscanf(int callback(void *), //
c = BUFFER; c = BUFFER;
do { do {
bool isdigit = c >= '0' && c <= '9'; bool isdigit = c >= '0' && c <= '9';
bool isletter = (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); bool isletter =
(c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
if (!(c == '_' || isdigit || isletter)) { if (!(c == '_' || isdigit || isletter)) {
goto Done; goto Done;
} }
@ -485,7 +487,11 @@ int __vcscanf(int callback(void *), //
continue; continue;
ReportConsumed: ReportConsumed:
n_ptr = va_arg(va, int *); n_ptr = va_arg(va, int *);
if (c != -1) {
*n_ptr = consumed - 1; // minus lookahead *n_ptr = consumed - 1; // minus lookahead
} else {
*n_ptr = consumed;
}
continue; continue;
DecodeString: DecodeString:
bufsize = !width ? 32 : rawmode ? width : width + 1; bufsize = !width ? 32 : rawmode ? width : width + 1;

30
test/libc/stdio/sscanf_test.c
View file

@ -383,7 +383,8 @@ TEST(sscanf, floating_point_infinity) {
TEST(sscanf, floating_point_infinity_double_precision) { TEST(sscanf, floating_point_infinity_double_precision) {
double a = 666.666, b = a, c = b, d = c, e = d, f = e, g = f; double a = 666.666, b = a, c = b, d = c, e = d, f = e, g = f;
EXPECT_EQ(4, sscanf("inf +INF -iNf InF", "%lf %lf %lf %lf", &a, &b, &c, &d)); EXPECT_EQ(4, sscanf("inf +INF -iNf InF", "%lf %lf %lf %lf", &a, &b, &c, &d));
EXPECT_EQ(3, sscanf("+infinity -INFINITY iNfInItY", "%lf %lf %lf", &e, &f, &g)); EXPECT_EQ(3,
sscanf("+infinity -INFINITY iNfInItY", "%lf %lf %lf", &e, &f, &g));
EXPECT_TRUE(isinf(a)); EXPECT_TRUE(isinf(a));
EXPECT_TRUE(isinf(b)); EXPECT_TRUE(isinf(b));
EXPECT_TRUE(isinf(c)); EXPECT_TRUE(isinf(c));
@ -394,11 +395,14 @@ TEST(sscanf, floating_point_infinity_double_precision) {
} }
TEST(sscanf, floating_point_documentation_examples) { TEST(sscanf, floating_point_documentation_examples) {
float a = 666.666f, b = a, c = b, d = c, e = d, f = e, g = f, h = g, i = h, j = i; float a = 666.666f, b = a, c = b, d = c, e = d, f = e, g = f, h = g, i = h,
j = i;
EXPECT_EQ(2, sscanf("111.11 -2.22", "%f %f", &a, &b)); EXPECT_EQ(2, sscanf("111.11 -2.22", "%f %f", &a, &b));
EXPECT_EQ(3, sscanf("Nan nan(2) inF", "%f %f %f", &c, &d, &e)); EXPECT_EQ(3, sscanf("Nan nan(2) inF", "%f %f %f", &c, &d, &e));
EXPECT_EQ(5, sscanf("0X1.BC70A3D70A3D7P+6 1.18973e+4932zzz -0.0000000123junk junk", "%f %f %f %f %f", &f, &g, &h, &i, &j)); EXPECT_EQ(
5, sscanf("0X1.BC70A3D70A3D7P+6 1.18973e+4932zzz -0.0000000123junk junk",
"%f %f %f %f %f", &f, &g, &h, &i, &j));
EXPECT_EQ(111.11f, a); EXPECT_EQ(111.11f, a);
EXPECT_EQ(-2.22f, b); EXPECT_EQ(-2.22f, b);
@ -413,11 +417,14 @@ TEST(sscanf, floating_point_documentation_examples) {
} }
TEST(sscanf, floating_point_documentation_examples_double_precision) { TEST(sscanf, floating_point_documentation_examples_double_precision) {
double a = 666.666, b = a, c = b, d = c, e = d, f = e, g = f, h = g, i = h, j = i; double a = 666.666, b = a, c = b, d = c, e = d, f = e, g = f, h = g, i = h,
j = i;
EXPECT_EQ(2, sscanf("111.11 -2.22", "%lf %lf", &a, &b)); EXPECT_EQ(2, sscanf("111.11 -2.22", "%lf %lf", &a, &b));
EXPECT_EQ(3, sscanf("Nan nan(2) inF", "%lf %lf %lf", &c, &d, &e)); EXPECT_EQ(3, sscanf("Nan nan(2) inF", "%lf %lf %lf", &c, &d, &e));
EXPECT_EQ(5, sscanf("0X1.BC70A3D70A3D7P+6 1.18973e+4932zzz -0.0000000123junk junk", "%lf %lf %lf %lf %lf", &f, &g, &h, &i, &j)); EXPECT_EQ(
5, sscanf("0X1.BC70A3D70A3D7P+6 1.18973e+4932zzz -0.0000000123junk junk",
"%lf %lf %lf %lf %lf", &f, &g, &h, &i, &j));
EXPECT_EQ(111.11, a); EXPECT_EQ(111.11, a);
EXPECT_EQ(-2.22, b); EXPECT_EQ(-2.22, b);
@ -470,3 +477,16 @@ TEST(fscanf, wantDecimalButGotLetter_returnsZeroMatches) {
EXPECT_EQ(666, x); EXPECT_EQ(666, x);
fclose(f); fclose(f);
} }
TEST(scanf, n) {
int rc;
unsigned int a, b, c, d, port, len;
rc = sscanf("1.2.3.4:1848", "%u.%u.%u.%u:%u%n", &a, &b, &c, &d, &port, &len);
ASSERT_EQ(5, rc);
ASSERT_EQ(1, a);
ASSERT_EQ(2, b);
ASSERT_EQ(3, c);
ASSERT_EQ(4, d);
ASSERT_EQ(1848, port);
ASSERT_EQ(12, len);
}