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fix signed overflows at most-negative values in ato(i|l|ll)

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patch by Pascal Cuoq (with minor tweaks to comments)
This commit is contained in:
Rich Felker 2011-11-10 20:44:44 -05:00
parent 3ed8c9f2df
commit 0c4188f6d7
3 changed files with 9 additions and 6 deletions
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5
src/stdlib/atoi.c
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@ -9,7 +9,8 @@ int atoi(const char *s)
case '-': neg=1; case '-': neg=1;
case '+': s++; case '+': s++;
} }
/* Compute n as a negative number to avoid overflow on INT_MIN */
while (isdigit(*s)) while (isdigit(*s))
n = 10*n + *s++ - '0'; n = 10*n - (*s++ - '0');
return neg ? -n : n; return neg ? n : -n;
} }

5
src/stdlib/atol.c
View File

@ -10,7 +10,8 @@ long atol(const char *s)
case '-': neg=1; case '-': neg=1;
case '+': s++; case '+': s++;
} }
/* Compute n as a negative number to avoid overflow on LONG_MIN */
while (isdigit(*s)) while (isdigit(*s))
n = 10*n + *s++ - '0'; n = 10*n - (*s++ - '0');
return neg ? -n : n; return neg ? n : -n;
} }

5
src/stdlib/atoll.c
View File

@ -10,7 +10,8 @@ long long atoll(const char *s)
case '-': neg=1; case '-': neg=1;
case '+': s++; case '+': s++;
} }
/* Compute n as a negative number to avoid overflow on LLONG_MIN */
while (isdigit(*s)) while (isdigit(*s))
n = 10*n + *s++ - '0'; n = 10*n - (*s++ - '0');
return neg ? -n : n; return neg ? n : -n;
} }