[Bug libc/17727] New: hexadecimal string conversion functions

["god12 at niksula dot hut.fi" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17727

            Bug ID: 17727
           Summary: hexadecimal string conversion functions
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: god12 at niksula dot hut.fi
                CC: drepper.fsp at gmail dot com

To my great surprise I did not found functions to perform much needed
conversions from ascii strings to hex arrays and back. I was unable to find a
feature request as well.

I'm pretty sure that such functions are implemented anyway somewhere inside
binutils - would be nice to get them into glibc. This way authors of open
source software do not have to reinvent wheel over and over again every time
they got to covert user-supplied command-line arguments into binary
representation for some library calls and vice-versa - converting library call
results into string, printable for users.

The possible signatures could look like

int hex_to_ascii(uint8_t * in, char * out);
int ascii_to_hex(char * in, uint8_t * out);

with return value indicating error if any.

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