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33 lines
917 B
C
33 lines
917 B
C
#include "EXTERN.h"
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#include "perl.h"
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/* in ASCII order, not that it matters */
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static const char controllablechars[] = "?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_";
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int
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ebcdic_control(int ch)
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{
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if (ch > 'a') {
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char *ctlp;
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if (islower(ch))
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ch = toupper(ch);
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if ((ctlp = strchr(controllablechars, ch)) == 0) {
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die("unrecognised control character '%c'\n", ch);
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}
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if (ctlp == controllablechars)
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return('\177'); /* DEL */
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else
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return((unsigned char)(ctlp - controllablechars - 1));
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} else { /* Want uncontrol */
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if (ch == '\177' || ch == -1)
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return('?');
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else if (0 < ch && ch < (sizeof(controllablechars) - 1))
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return(controllablechars[ch+1]);
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else
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die("invalid control request: '\\%03o'\n", ch & 0xFF);
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}
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}
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