Parsing one string in two bases
char *next; unsigned long long n = strtoull("0789a", &next, 10); /* n == 789; *next == 'a' */ With base 0, the leading 0 selects octal instead: parsing stops at '8', after producing 7. The second argument receives the address where parsing ends. section 14.1
strtoull converts the initial numeric portion of a string to an unsigned long long value. Its end-pointer argument lets a caller continue scanning from the first character not consumed. section 14.1
A loop can use strtoull to collect successive numbers:
- Pass the current character pointer as the string argument and pass &next as the end-pointer argument. section 14.1
- Advance to next after each successful conversion; stop when next equals the input pointer, indicating that no number was found. section 14.1
97 static
98 size_t numberline_inner(char const*restrict act,
99 size_t numb[restrict], int base){
100 size_t n = 0;
101 for (char* next = 0; act[0]; act = next) {
102 numb[n] = strtoull(act, &next, base);
103 if (act == next) break;
104 ++n;
105 }
106 return n;
107 }
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Inspect the complete numberline_inner loop using strtoull, next, and the no-progress test. section 14.1
