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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <ctype.h>
define OCTAL 8
# CTOCC -- Convert a character into a printable character constant.
# Printable characters are output as is. The standard control characters
# (newline, tab, etc.) are output as escape sequences (\n, \t, etc.).
# Other control characters are output in the form '^X'. Characters which
# are neither printable nor standard control characters are output as
# octal constants of the form '\DDD'. Note that the ouput string is not
# enclosed in ticks ('\n', etc.), because the generated character constant
# might appear in a quoted string (or someplace other than an explicit
# character constant).
int procedure ctocc (ch, outstr, maxch)
char ch # character to be output
char outstr[ARB] # output string
int maxch # max chars out
int op, n
int stridx()
define output {outstr[op]=$1;op=op+1;if(op>maxch)goto overflow_}
define overflow_ 99
include "escchars.inc"
begin
op = 1
if (maxch > 0) {
if (IS_PRINT(ch)) { # output char as is
output (ch)
} else if (IS_CNTRL (ch)) {
n = stridx (ch, mapped_chars)
if (n > 0) { # '\c'
output ('\\')
output (escape_chars[n])
} else {
output ('^') # control chars
output (ch + 'A' - 1)
}
} else { # '\nnn'
# Always output 3 digits so that strings like \0405 (a blank
# followed by a `5') can be interpreted during the reverse
# encoding operation.
output ('\\')
output (TO_DIGIT (mod (ch / 0100B, 010B)))
output (TO_DIGIT (mod (ch / 0010B, 010B)))
output (TO_DIGIT (mod (ch / 0001B, 010B)))
}
}
outstr[op] = EOS
return (op-1)
overflow_
outstr[1] = '?' # no room, print '?'
outstr[2] = EOS
return (1)
end
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