| 1 | #include "EXTERN.h" |
| 2 | #define PERL_IN_EBCDIC_C |
| 3 | #include "perl.h" |
| 4 | |
| 5 | /* in ASCII order, not that it matters */ |
| 6 | static const char controllablechars[] = "?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"; |
| 7 | |
| 8 | int |
| 9 | ebcdic_control(int ch) |
| 10 | { |
| 11 | if (ch > 'a') { |
| 12 | char *ctlp; |
| 13 | |
| 14 | if (islower(ch)) |
| 15 | ch = toupper(ch); |
| 16 | |
| 17 | if ((ctlp = strchr(controllablechars, ch)) == 0) { |
| 18 | Perl_die(aTHX_ "unrecognised control character '%c'\n", ch); |
| 19 | } |
| 20 | |
| 21 | if (ctlp == controllablechars) |
| 22 | return('\177'); /* DEL */ |
| 23 | else |
| 24 | return((unsigned char)(ctlp - controllablechars - 1)); |
| 25 | } else { /* Want uncontrol */ |
| 26 | if (ch == '\177' || ch == -1) |
| 27 | return('?'); |
| 28 | else if (ch == '\157') |
| 29 | return('\177'); |
| 30 | else if (ch == '\174') |
| 31 | return('\000'); |
| 32 | else if (ch == '^') /* '\137' in 1047, '\260' in 819 */ |
| 33 | return('\036'); |
| 34 | else if (ch == '\155') |
| 35 | return('\037'); |
| 36 | else if (0 < ch && ch < (sizeof(controllablechars) - 1)) |
| 37 | return(controllablechars[ch+1]); |
| 38 | else |
| 39 | Perl_die(aTHX_ "invalid control request: '\\%03o'\n", ch & 0xFF); |
| 40 | } |
| 41 | } |