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This noncompliant code example may pass invalid values to the isspace() function.
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size_t count_preceding_whitespace(const char *s) {
const char *t = s;
/* possibly *t < 0 */
while (*t && isspace(*t)) {
++t;
}
return t - s;
}
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This compliant solution casts the character to unsigned char before passing it as an argument to the isspace() function.
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size_t count_preceding_whitespace(const char *s) {
const char *t = s;
while (*t && isspace((unsigned char)*t)) {
++t;
}
return t - s;
}
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