common/man/chr.3

        .fp 5 CW
..
.nr ;G \\n(.f
.Af "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7" "\\$8" "\\$9"
\\*(;G
..
.aF 5 \\n(.f "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7"
..
.aF 5 1 "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7"
..
.aF 1 5 "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7"
..


 0
..


..
 CHR 3
 NAME
chr - character constant conversion routines
 SYNOPSIS
.EX
#include <ast.h>

int chresc(const char* s, char** e);
int chrtoi(const char* s);

 DESCRIPTION
.L chresc
converts and returns the next character constant in the 0-terminated string
 s . If
 e is not 0 then
 *e is set to point to the next character in
 s on return.
0 is returned and
 e is not modified when the end of
 s is reached.

.L chrtoi
converts the 0-terminated string
 s to an
 int and returns the value.
The characters in
 s are converted in order from the left and shifted into the
 int value until up to the number of characters in an
 int is reached.
This operation is inherently machine-dependent,
but at least its defined in one place.

The following
 \e escape sequences are recognized:

 \e ooo The character represented by the octal code
 ooo .
 \ex xx The character represented by the hex code
 xx .
.L \ea
Alert (bell).

.L \eb
Backspace.

.L \ef
Formfeed.

.L \en
Newline.

.L \er
Carriage return.

.L \et
Horizontal tab.

.L \ev
Vertical tab.

.L \eE
ESC (escape).

.L \e\e
Backslash.

Other characters following
 \e are undefined (although for backwards compatibility they
translate to themselves).
 "SEE ALSO"
str(3)