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98 lines
1.9 KiB
98 lines
1.9 KiB
2 months ago
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/*
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* UCW Library -- String Unescaping
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*
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* (c) 2006 Pavel Charvat <pchar@ucw.cz>
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* (c) 2007 Martin Mares <mj@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#undef LOCAL_DEBUG
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#include <ucw/lib.h>
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#include <ucw/string.h>
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#include <ucw/chartype.h>
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#include <stdlib.h>
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char *
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str_unesc(char *d, const char *s)
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{
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while (*s)
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{
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if (*s == '\\')
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switch (s[1])
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{
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case 'a': *d++ = '\a'; s += 2; break;
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case 'b': *d++ = '\b'; s += 2; break;
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case 'f': *d++ = '\f'; s += 2; break;
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case 'n': *d++ = '\n'; s += 2; break;
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case 'r': *d++ = '\r'; s += 2; break;
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case 't': *d++ = '\t'; s += 2; break;
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case 'v': *d++ = '\v'; s += 2; break;
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case '\?': *d++ = '\?'; s += 2; break;
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case '\'': *d++ = '\''; s += 2; break;
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case '\"': *d++ = '\"'; s += 2; break;
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case '\\': *d++ = '\\'; s += 2; break;
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case 'x':
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if (!Cxdigit(s[2]))
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{
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s++;
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DBG("\\x used with no following hex digits");
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}
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else
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{
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char *p;
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uint v = strtoul(s + 2, &p, 16);
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if (v <= 255)
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*d++ = v;
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else
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DBG("hex escape sequence out of range");
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s = (char *)p;
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}
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break;
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default:
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if (s[1] >= '0' && s[1] <= '7')
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{
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uint v = s[1] - '0';
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s += 2;
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for (uint i = 0; i < 2 && *s >= '0' && *s <= '7'; s++, i++)
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v = (v << 3) + *s - '0';
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if (v <= 255)
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*d++ = v;
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else
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DBG("octal escape sequence out of range");
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}
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else
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*d++ = *s++;
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break;
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}
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else
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*d++ = *s++;
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}
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*d = 0;
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return d;
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}
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#ifdef TEST
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#include <stdio.h>
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#include <string.h>
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int main(int argc, char **argv)
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{
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if (argc < 2)
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return 1;
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char tmp[strlen(argv[1]) + 1];
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int len = str_unesc(tmp, argv[1]) - tmp;
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char hex[2*len + 1];
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mem_to_hex(hex, tmp, len, ' ');
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puts(hex);
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return 0;
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}
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#endif
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