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LibC+Userland: Prefer snprintf over sprintf

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I ignored the sprintf in Userland/cal.cpp because it's too much trouble.
However, this only underlines the need for bounds checking.
This commit is contained in:
Ben Wiederhake 2020-08-16 18:18:07 +02:00 committed by Andreas Kling
parent 1aad0f8b16
commit 4f77ccbda8
Notes: sideshowbarker 2024-07-19 03:16:58 +09:00 
Author: https://github.com/BenWiederhake
Commit: https://github.com/SerenityOS/serenity/commit/4f77ccbda81
Pull-request: https://github.com/SerenityOS/serenity/pull/3263
2 changed files with 7 additions and 3 deletions
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4
Libraries/LibC/netdb.cpp
View File

@ -100,7 +100,9 @@ hostent* gethostbyname(const char* name)
{
auto ipv4_address = IPv4Address::from_string(name);
if (ipv4_address.has_value()) {
sprintf(__gethostbyname_name_buffer, "%s", ipv4_address.value().to_string().characters());
auto ip4_string = ipv4_address.value().to_string();
ASSERT(ip4_string.length() < sizeof(__gethostbyname_name_buffer));
strncpy(__gethostbyname_name_buffer, ip4_string.characters(), ip4_string.length());
__gethostbyname_buffer.h_name = __gethostbyname_name_buffer;
__gethostbyname_buffer.h_aliases = nullptr;
__gethostbyname_buffer.h_addrtype = AF_INET;

6
Userland/seq.cpp
View File

@ -35,7 +35,7 @@ static double get_double(const char* name, const char* d_string, int* number_of_
char* end;
double d = strtod(d_string, &end);
if (d == 0 && end == d_string) {
fprintf(stderr, "%s: invalid double vallue \"%s\"\n", name, d_string);
fprintf(stderr, "%s: invalid double value \"%s\"\n", name, d_string);
exit(1);
}
if (char* dot = strchr(d_string, '.'))
@ -95,7 +95,7 @@ int main(int argc, const char* argv[])
double d = start;
for (int i = 0; i <= n; ++i) {
char buf[40];
sprintf(buf, "%f", d); // FIXME: Serenity's printf() doesn't seem to handle %f correctly: For `seq 1 0.1 2` this always prints "1.0" as `d` goes from 1.0 to 2.0.
snprintf(buf, sizeof(buf), "%f", d);
if (char* dot = strchr(buf, '.')) {
if (number_of_decimals == 0)
*dot = '\0';
@ -105,4 +105,6 @@ int main(int argc, const char* argv[])
printf("%s\n", buf);
d += step;
}
return 0;
}