107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
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/*
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* Copyright 1998 by Albert Cahalan; all rights resered.
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* This file may be used subject to the terms and conditions of the
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* GNU Library General Public License Version 2, or any later version
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* at your option, as published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*/
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#include <sys/types.h>
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/* sanitize a string, without the nice BSD library function: */
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/* strvis(vis_args, k->ki_args, VIS_TAB | VIS_NL | VIS_NOSLASH) */
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int octal_escape_str(char *dst, const char *src, size_t n){
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unsigned char c;
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char d;
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size_t i;
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const char *codes =
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"Z------abtnvfr-------------e----"
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" *******************************" /* better: do not print any space */
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"****************************\\***"
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"*******************************-"
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"--------------------------------"
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"********************************"
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"********************************"
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"********************************";
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for(i=0; i<n;){
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c = (unsigned char) *(src++);
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d = codes[c];
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switch(d){
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case 'Z':
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goto leave;
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case '*':
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i++;
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*(dst++) = c;
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break;
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case '-':
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if(i+4 > n) goto leave;
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i += 4;
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*(dst++) = '\\';
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*(dst++) = "01234567"[c>>6];
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*(dst++) = "01234567"[(c>>3)&07];
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*(dst++) = "01234567"[c&07];
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break;
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default:
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if(i+2 > n) goto leave;
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i += 2;
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*(dst++) = '\\';
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*(dst++) = d;
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break;
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}
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}
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leave:
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*(dst++) = '\0';
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return i;
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}
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/* sanitize a string via one-way mangle */
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int simple_escape_str(char *dst, const char *src, size_t n){
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unsigned char c;
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size_t i;
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const char *codes =
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"Z-------------------------------"
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"********************************"
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"********************************"
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"*******************************-"
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"--------------------------------"
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"********************************"
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"********************************"
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"********************************";
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for(i=0; i<n;){
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c = (unsigned char) *(src++);
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switch(codes[c]){
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case 'Z':
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goto leave;
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case '*':
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i++;
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*(dst++) = c;
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break;
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case '-':
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i++;
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*(dst++) = '?';
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break;
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}
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}
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leave:
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*(dst++) = '\0';
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return i;
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}
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/* escape a string as desired */
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int escape_str(char *dst, const char *src, size_t n){
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return simple_escape_str(dst, src, n);
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}
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/* escape an argv or environment string array */
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int escape_strlist(char *dst, const char **src, size_t n){
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size_t i = 0;
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while(*src){
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i += simple_escape_str(dst+i, *src, n-i);
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if((n-i > 1) && (*(src+1))) dst[i++] = ' ';
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src++;
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}
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return i;
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}
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