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| author | Rich Felker <dalias@aerifal.cx> | 2011-11-10 20:44:44 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-11-10 20:44:44 -0500 |
| commit | 0c4188f6d76fad021a93eb1012630c717bda80a1 (patch) | |
| tree | cf750ce90574fa55b066de623c0ce42005a26545 /src/stdlib/atoll.c | |
| parent | fix all missing instances of __cplusplus checks/extern "C" in headers (diff) | |
| download | grovel-0c4188f6d76fad021a93eb1012630c717bda80a1.tar.gz grovel-0c4188f6d76fad021a93eb1012630c717bda80a1.tar.xz | |
fix signed overflows at most-negative values in ato(i|l|ll)
patch by Pascal Cuoq (with minor tweaks to comments)
Diffstat (limited to '')
| -rw-r--r-- | src/stdlib/atoll.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/stdlib/atoll.c b/src/stdlib/atoll.c index 0e03e0a1..b6930489 100644 --- a/src/stdlib/atoll.c +++ b/src/stdlib/atoll.c @@ -10,7 +10,8 @@ long long atoll(const char *s) case '-': neg=1; case '+': s++; } + /* Compute n as a negative number to avoid overflow on LLONG_MIN */ while (isdigit(*s)) - n = 10*n + *s++ - '0'; - return neg ? -n : n; + n = 10*n - (*s++ - '0'); + return neg ? n : -n; } |