34 lines
616 B
C
34 lines
616 B
C
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#include <ctype.h>
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float strtof(const char *str, char **endptr)
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{
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float res = 0.0F;
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char *ptr = (char*)str;
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int after_dot = 0;
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float div = 1;
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while (*ptr != '\0') {
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if (isdigit(*ptr)) {
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if (!after_dot) {
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res *= 10;
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res += *ptr - '0';
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} else {
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div *= 10;
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res += (float)(*ptr - '0') / div;
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}
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} else if (*ptr == '.') {
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after_dot = 1;
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} else {
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break;
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}
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ptr++;
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}
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if (endptr) {
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*endptr = ptr;
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}
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return res;
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}
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