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a7da7922 NN |
1 | #ifndef UTIL_LINUX_CAREFULPUTC_H |
2 | #define UTIL_LINUX_CAREFULPUTC_H | |
48d7b13a | 3 | |
459e95f3 BS |
4 | /* |
5 | * A putc() for use in write and wall (that sometimes are sgid tty). | |
6 | * It avoids control characters in our locale, and also ASCII control | |
7 | * characters. Note that the locale of the recipient is unknown. | |
8 | */ | |
66ee8158 | 9 | #include <stdio.h> |
78a3b0af KZ |
10 | #include <string.h> |
11 | #include <ctype.h> | |
66ee8158 | 12 | |
76b680b1 RP |
13 | #include "cctype.h" |
14 | ||
c6d2d74e SK |
15 | static inline int fputc_careful(int c, FILE *fp, const char fail) |
16 | { | |
66ee8158 KZ |
17 | int ret; |
18 | ||
c6d2d74e | 19 | if (isprint(c) || c == '\a' || c == '\t' || c == '\r' || c == '\n') |
66ee8158 | 20 | ret = putc(c, fp); |
76b680b1 | 21 | else if (!c_isascii(c)) |
c6d2d74e | 22 | ret = fprintf(fp, "\\%3o", (unsigned char)c); |
66ee8158 | 23 | else { |
ada6c48f | 24 | ret = putc(fail, fp); |
66ee8158 | 25 | if (ret != EOF) |
c6d2d74e | 26 | ret = putc(c ^ 0x40, fp); |
66ee8158 KZ |
27 | } |
28 | return (ret < 0) ? EOF : 0; | |
29 | } | |
48d7b13a | 30 | |
1ca2661b KZ |
31 | /* |
32 | * Requirements enumerated via testing (V8, Firefox, IE11): | |
33 | * | |
34 | * var charsToEscape = []; | |
35 | * for (var i = 0; i < 65535; i += 1) { | |
36 | * try { | |
37 | * JSON.parse('{"sample": "' + String.fromCodePoint(i) + '"}'); | |
38 | * } catch (e) { | |
39 | * charsToEscape.push(i); | |
40 | * } | |
41 | * } | |
42 | */ | |
43 | static inline void fputs_quoted_case_json(const char *data, FILE *out, int dir) | |
44 | { | |
45 | const char *p; | |
46 | ||
47 | fputc('"', out); | |
48 | for (p = data; p && *p; p++) { | |
49 | ||
50 | const unsigned char c = (unsigned char) *p; | |
51 | ||
52 | /* From http://www.json.org | |
53 | * | |
54 | * The double-quote and backslashes would break out a string or | |
55 | * init an escape sequence if not escaped. | |
56 | * | |
57 | * Note that single-quotes and forward slashes, while they're | |
58 | * in the JSON spec, don't break double-quoted strings. | |
59 | */ | |
60 | if (c == '"' || c == '\\') { | |
61 | fputc('\\', out); | |
62 | fputc(c, out); | |
63 | continue; | |
64 | } | |
65 | ||
66 | /* All non-control characters OK; do the case swap as required. */ | |
67 | if (c >= 0x20) { | |
68 | fputc(dir == 1 ? toupper(c) : | |
69 | dir == -1 ? tolower(c) : *p, out); | |
70 | continue; | |
71 | } | |
72 | ||
73 | /* In addition, all chars under ' ' break Node's/V8/Chrome's, and | |
74 | * Firefox's JSON.parse function | |
75 | */ | |
76 | switch (c) { | |
77 | /* Handle short-hand cases to reduce output size. C | |
78 | * has most of the same stuff here, so if there's an | |
79 | * "Escape for C" function somewhere in the STL, we | |
80 | * should probably be using it. | |
81 | */ | |
82 | case '\b': | |
83 | fputs("\\b", out); | |
84 | break; | |
85 | case '\t': | |
86 | fputs("\\t", out); | |
87 | break; | |
88 | case '\n': | |
89 | fputs("\\n", out); | |
90 | break; | |
91 | case '\f': | |
92 | fputs("\\f", out); | |
93 | break; | |
94 | case '\r': | |
95 | fputs("\\r", out); | |
96 | break; | |
97 | default: | |
98 | /* Other assorted control characters */ | |
99 | fprintf(out, "\\u00%02x", c); | |
100 | break; | |
101 | } | |
102 | } | |
103 | fputc('"', out); | |
104 | } | |
105 | ||
106 | ||
6a768b55 | 107 | static inline void fputs_quoted_case(const char *data, FILE *out, int dir) |
78a3b0af KZ |
108 | { |
109 | const char *p; | |
110 | ||
111 | fputc('"', out); | |
112 | for (p = data; p && *p; p++) { | |
113 | if ((unsigned char) *p == 0x22 || /* " */ | |
114 | (unsigned char) *p == 0x5c || /* \ */ | |
cca51b9e KZ |
115 | (unsigned char) *p == 0x60 || /* ` */ |
116 | (unsigned char) *p == 0x24 || /* $ */ | |
78a3b0af KZ |
117 | !isprint((unsigned char) *p) || |
118 | iscntrl((unsigned char) *p)) { | |
119 | ||
120 | fprintf(out, "\\x%02x", (unsigned char) *p); | |
121 | } else | |
6a768b55 KZ |
122 | fputc(dir == 1 ? toupper(*p) : |
123 | dir == -1 ? tolower(*p) : | |
124 | *p, out); | |
78a3b0af KZ |
125 | } |
126 | fputc('"', out); | |
127 | } | |
128 | ||
6a768b55 KZ |
129 | #define fputs_quoted(_d, _o) fputs_quoted_case(_d, _o, 0) |
130 | #define fputs_quoted_upper(_d, _o) fputs_quoted_case(_d, _o, 1) | |
131 | #define fputs_quoted_lower(_d, _o) fputs_quoted_case(_d, _o, -1) | |
132 | ||
1ca2661b KZ |
133 | #define fputs_quoted_json(_d, _o) fputs_quoted_case_json(_d, _o, 0) |
134 | #define fputs_quoted_json_upper(_d, _o) fputs_quoted_case_json(_d, _o, 1) | |
135 | #define fputs_quoted_json_lower(_d, _o) fputs_quoted_case_json(_d, _o, -1) | |
136 | ||
78a3b0af KZ |
137 | static inline void fputs_nonblank(const char *data, FILE *out) |
138 | { | |
139 | const char *p; | |
140 | ||
141 | for (p = data; p && *p; p++) { | |
142 | if (isblank((unsigned char) *p) || | |
143 | (unsigned char) *p == 0x5c || /* \ */ | |
144 | !isprint((unsigned char) *p) || | |
145 | iscntrl((unsigned char) *p)) { | |
146 | ||
147 | fprintf(out, "\\x%02x", (unsigned char) *p); | |
148 | ||
149 | } else | |
150 | fputc(*p, out); | |
151 | } | |
152 | } | |
153 | ||
154 | ||
a7da7922 | 155 | #endif /* _CAREFULPUTC_H */ |