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The GNU C Library

5.7.1 Compatibility String Search Functions

Function: char * index (const char *string, int c)

index is another name for strchr; they are exactly the same. New code should always use strchr since this name is defined in ISO C while index is a BSD invention which never was available on System V derived systems.

Function: char * rindex (const char *string, int c)

rindex is another name for strrchr; they are exactly the same. New code should always use strrchr since this name is defined in ISO C while rindex is a BSD invention which never was available on System V derived systems.