2 * Copyright (c) 1989, 1993
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29 * $FreeBSD: src/lib/libc/gen/vis.c,v 1.13 2003/10/30 12:41:50 phk Exp $
30 * $DragonFly: src/lib/libc/gen/vis.c,v 1.6 2005/11/13 00:07:42 swildner Exp $
33 #include <sys/types.h>
40 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
43 * vis - visually encode characters
46 vis(char *dst, int c, int flag, int nextc)
50 if (flag & VIS_HTTPSTYLE) {
51 /* Described in RFC 1808 */
52 if (!(isalnum(c) /* alpha-numeric */
54 || c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
56 || c == '!' || c == '*' || c == '\'' || c == '('
57 || c == ')' || c == ',')) {
59 snprintf(dst, 4, (c < 16 ? "0%X" : "%X"), c);
65 if ((flag & VIS_GLOB) &&
66 (c == '*' || c == '?' || c == '[' || c == '#'))
68 else if (isgraph(c) ||
69 ((flag & VIS_SP) == 0 && c == ' ') ||
70 ((flag & VIS_TAB) == 0 && c == '\t') ||
71 ((flag & VIS_NL) == 0 && c == '\n') ||
72 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
74 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
80 if (flag & VIS_CSTYLE) {
117 if (isoctal(nextc)) {
124 if (((c & 0177) == ' ') || isgraph(c) || (flag & VIS_OCTAL)) {
126 *dst++ = ((u_char)c >> 6 & 07) + '0';
127 *dst++ = ((u_char)c >> 3 & 07) + '0';
128 *dst++ = ((u_char)c & 07) + '0';
131 if ((flag & VIS_NOSLASH) == 0)
153 * strvis, strvisx - visually encode characters from src into dst
155 * Dst must be 4 times the size of src to account for possible
156 * expansion. The length of dst, not including the trailing NUL,
159 * Strvisx encodes exactly len bytes from src into dst.
160 * This is useful for encoding a block of data.
163 strvis(char *dst, const char *src, int flag)
168 for (start = dst; (c = *src); )
169 dst = vis(dst, c, flag, *++src);
171 return (dst - start);
175 strnvis(char *dst, const char *src, size_t len, int flag)
183 end = start + len -1;
184 for (; (c = *src) != '\0';) {
185 i = vis(buf, c, flag, *++src) - buf;
186 if (start + i > end) {
196 /* adjust return value for truncation */
197 while ((c = *src) != '\0')
198 dst += vis(buf, c, flag, *++src) - buf;
200 return (dst - start);
204 strvisx(char *dst, const char *src, size_t len, int flag)
209 for (start = dst; len > 1; len--) {
211 dst = vis(dst, c, flag, *++src);
214 dst = vis(dst, *src, flag, '\0');
217 return (dst - start);