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