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42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
#include "scan.h"
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static const unsigned long maxlong = ((unsigned long)-1)>>1;
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#ifdef UNITTEST
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#undef UNITTEST
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#include "scan_ulonglong.c"
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#define UNITTEST
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#endif
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size_t scan_longlong(const char* src,signed long long* dest) {
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size_t i,o;
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unsigned long long l;
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char c=src[0];
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unsigned int neg=c=='-';
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o=c=='-' || c=='+';
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if ((i=scan_ulonglong(src+o,&l))) {
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if (i>0 && l>maxlong+neg) {
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l/=10;
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--i;
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}
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if (i+o) *dest=(signed long long)(c=='-'?-l:l);
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return i+o;
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} return 0;
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}
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#ifdef UNITTEST
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#include <assert.h>
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int main() {
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long long i;
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assert(scan_longlong("1234",&i)==4 && i==1234);
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assert(scan_longlong("-1234",&i)==5 && i==-1234);
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assert(scan_longlong("+1234",&i)==5 && i==1234);
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assert(scan_longlong("2147483647",&i)==10 && i==2147483647); // INT_MAX
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assert(scan_longlong("-2147483648",&i)==11 && i==-2147483648); // INT_MIN
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assert(scan_longlong("9223372036854775807",&i)==19 && i==0x7fffffffffffffffull); // LONG_MAX
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assert(scan_longlong("-9223372036854775808",&i)==20 && i==(long long)0x8000000000000000ull); // LONG_MIN
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return 0;
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}
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#endif
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