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33 * $FreeBSD: src/lib/libc/gen/vis.c,v 1.13 2003/10/30 12:41:50 phk Exp $
34 * $DragonFly: src/lib/libc/gen/vis.c,v 1.6 2005/11/13 00:07:42 swildner Exp $
37 #include <sys/types.h>
44 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
47 * vis - visually encode characters
50 vis(char *dst, int c, int flag, int nextc)
54 if (flag & VIS_HTTPSTYLE) {
55 /* Described in RFC 1808 */
56 if (!(isalnum(c) /* alpha-numeric */
58 || c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
60 || c == '!' || c == '*' || c == '\'' || c == '('
61 || c == ')' || c == ',')) {
63 snprintf(dst, 4, (c < 16 ? "0%X" : "%X"), c);
69 if ((flag & VIS_GLOB) &&
70 (c == '*' || c == '?' || c == '[' || c == '#'))
72 else if (isgraph(c) ||
73 ((flag & VIS_SP) == 0 && c == ' ') ||
74 ((flag & VIS_TAB) == 0 && c == '\t') ||
75 ((flag & VIS_NL) == 0 && c == '\n') ||
76 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
78 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
84 if (flag & VIS_CSTYLE) {
121 if (isoctal(nextc)) {
128 if (((c & 0177) == ' ') || isgraph(c) || (flag & VIS_OCTAL)) {
130 *dst++ = ((u_char)c >> 6 & 07) + '0';
131 *dst++ = ((u_char)c >> 3 & 07) + '0';
132 *dst++ = ((u_char)c & 07) + '0';
135 if ((flag & VIS_NOSLASH) == 0)
157 * strvis, strvisx - visually encode characters from src into dst
159 * Dst must be 4 times the size of src to account for possible
160 * expansion. The length of dst, not including the trailing NUL,
163 * Strvisx encodes exactly len bytes from src into dst.
164 * This is useful for encoding a block of data.
167 strvis(char *dst, const char *src, int flag)
172 for (start = dst; (c = *src); )
173 dst = vis(dst, c, flag, *++src);
175 return (dst - start);
179 strnvis(char *dst, const char *src, size_t len, int flag)
187 end = start + len -1;
188 for (; (c = *src) != '\0';) {
189 i = vis(buf, c, flag, *++src) - buf;
190 if (start + i > end) {
200 /* adjust return value for truncation */
201 while ((c = *src) != '\0')
202 dst += vis(buf, c, flag, *++src) - buf;
204 return (dst - start);
208 strvisx(char *dst, const char *src, size_t len, int flag)
213 for (start = dst; len > 1; len--) {
215 dst = vis(dst, c, flag, *++src);
218 dst = vis(dst, *src, flag, '\0');
221 return (dst - start);