mirror of
https://github.com/9fans/plan9port.git
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49 lines
789 B
C
49 lines
789 B
C
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/*
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* upas/unesc - interpret =?foo?bar?=char?= escapes
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*/
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#include <stdio.h>
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#include <stdlib.h>
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int
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hex(int c)
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{
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if('0' <= c && c <= '9')
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return c - '0';
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if('A' <= c && c <= 'F')
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return c - 'A' + 10;
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if('a' <= c && c <= 'f')
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return c - 'a' + 10;
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return 0;
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}
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void
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main(int argc, char **argv)
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{
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int c;
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while((c=getchar()) != EOF){
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if(c == '='){
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if((c=getchar()) == '?'){
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while((c=getchar()) != EOF && c != '?')
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continue;
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while((c=getchar()) != EOF && c != '?')
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continue;
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while((c=getchar()) != EOF && c != '?'){
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if(c == '='){
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c = hex(getchar()) << 4;
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c |= hex(getchar());
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}
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putchar(c);
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}
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(void) getchar(); /* consume '=' */
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}else{
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putchar('=');
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putchar(c);
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}
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}else
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putchar(c);
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}
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exit(0);
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}
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