2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
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15 * This product includes software developed by the University of
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33 * $FreeBSD: src/lib/libc/gen/vis.c,v 1.5.8.2 2001/03/05 09:44:34 obrien Exp $
34 * $DragonFly: src/lib/libc/gen/vis.c,v 1.3 2004/06/06 15:05:55 hmp Exp $
36 * @(#)vis.c 8.1 (Berkeley) 7/19/93
39 #include <sys/types.h>
45 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
48 * vis - visually encode characters
51 vis(dst, c, flag, nextc)
58 if (flag & VIS_HTTPSTYLE) {
59 /* Described in RFC 1808 */
60 if (!(isalnum(c) /* alpha-numeric */
62 || c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
64 || c == '!' || c == '*' || c == '\'' || c == '('
65 || c == ')' || c == ',')) {
67 snprintf(dst, 4, (c < 16 ? "0%X" : "%X"), c);
74 ((flag & VIS_SP) == 0 && c == ' ') ||
75 ((flag & VIS_TAB) == 0 && c == '\t') ||
76 ((flag & VIS_NL) == 0 && c == '\n') ||
77 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
79 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
85 if (flag & VIS_CSTYLE) {
126 if (isoctal(nextc)) {
133 if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
135 *dst++ = ((u_char)c >> 6 & 07) + '0';
136 *dst++ = ((u_char)c >> 3 & 07) + '0';
137 *dst++ = ((u_char)c & 07) + '0';
140 if ((flag & VIS_NOSLASH) == 0)
162 * strvis, strvisx - visually encode characters from src into dst
164 * Dst must be 4 times the size of src to account for possible
165 * expansion. The length of dst, not including the trailing NULL,
168 * Strvisx encodes exactly len bytes from src into dst.
169 * This is useful for encoding a block of data.
172 strvis(dst, src, flag)
180 for (start = dst; (c = *src); )
181 dst = vis(dst, c, flag, *++src);
183 return (dst - start);
187 strvisx(dst, src, len, flag)
196 for (start = dst; len > 1; len--) {
198 dst = vis(dst, c, flag, *++src);
201 dst = vis(dst, *src, flag, '\0');
204 return (dst - start);