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#include <strings.h>char *index(const char *s, int c);
char *rindex(const char *s, int c);
rindex- character string operation
The index function is identical to the strchr function. The rindex function is identical to the strrchr function. See string(S). index and rindex are provided for backwards compatibility: strchr and strrchr are to be recommended.
X/Open Portability Guide Issue 4, Version 2 (Spec-1170).