18 lines
308 B
C
18 lines
308 B
C
#include <stdlib.h>
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#include <ctype.h>
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long atol(const char *s)
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{
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long n=0;
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int neg=0;
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while (isspace(*s)) s++;
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switch (*s) {
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case '-': neg=1;
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case '+': s++;
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}
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/* Compute n as a negative number to avoid overflow on LONG_MIN */
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while (isdigit(*s))
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n = 10*n - (*s++ - '0');
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return neg ? n : -n;
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}
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