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comp.lang.c FAQ list · Question 13.24

Q: I'm trying to port this old program. Why do I get ``undefined external'' errors for some library functions?

A: Some old or semistandard functions have been renamed or replaced over the years;
if you need:/you should instead:

use strchr.
use strrchr.
use memmove, after interchanging the first and second arguments (see also question 11.25).
use memcmp.
use memset, with a second argument of 0.

See also questions 12.22 and 13.21.

References: PCS Sec. 11

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