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git.ipfire.org Git - thirdparty/git.git/blob - quote.c
4 /* Help to copy the thing properly quoted for the shell safety.
5 * any single quote is replaced with '\'', any exclamation point
6 * is replaced with '\!', and the whole thing is enclosed in a
9 * original sq_quote result
10 * name ==> name ==> 'name'
11 * a b ==> a b ==> 'a b'
12 * a'b ==> a'\''b ==> 'a'\''b'
13 * a!b ==> a'\!'b ==> 'a'\!'b'
16 #define EMIT(x) do { if (++len < n) *bp++ = (x); } while(0)
18 static inline int need_bs_quote(char c
)
20 return (c
== '\'' || c
== '!');
23 size_t sq_quote_buf(char *dst
, size_t n
, const char *src
)
30 while ((c
= *src
++)) {
31 if (need_bs_quote(c
)) {
48 void sq_quote_print(FILE *stream
, const char *src
)
53 while ((c
= *src
++)) {
54 if (need_bs_quote(c
)) {
65 char *sq_quote(const char *src
)
70 cnt
= sq_quote_buf(NULL
, 0, src
) + 1;
72 sq_quote_buf(buf
, cnt
, src
);
77 char *sq_dequote(char *arg
)
93 /* We stepped out of sq */
100 if (need_bs_quote(c
) && *++src
== '\'') {
112 * C-style name quoting.
114 * Does one of three things:
116 * (1) if outbuf and outfp are both NULL, inspect the input name and
117 * counts the number of bytes that are needed to hold c_style
118 * quoted version of name, counting the double quotes around
119 * it but not terminating NUL, and returns it. However, if name
120 * does not need c_style quoting, it returns 0.
122 * (2) if outbuf is not NULL, it must point at a buffer large enough
123 * to hold the c_style quoted version of name, enclosing double
124 * quotes, and terminating NUL. Fills outbuf with c_style quoted
125 * version of name enclosed in double-quote pair. Return value
128 * (3) if outfp is not NULL, outputs c_style quoted version of name,
129 * but not enclosed in double-quote pair. Return value is undefined.
132 static int quote_c_style_counted(const char *name
, int namelen
,
133 char *outbuf
, FILE *outfp
, int no_dq
)
137 (outbuf ? (*outbuf++ = (c)) : outfp ? fputc(c, outfp) : (count++))
139 #define EMITQ() EMIT('\\')
142 int ch
, count
= 0, needquote
= 0;
146 for (sp
= name
; sp
< name
+ namelen
; sp
++) {
150 if ((ch
< ' ') || (ch
== '"') || (ch
== '\\') ||
154 case '\a': EMITQ(); ch
= 'a'; break;
155 case '\b': EMITQ(); ch
= 'b'; break;
156 case '\f': EMITQ(); ch
= 'f'; break;
157 case '\n': EMITQ(); ch
= 'n'; break;
158 case '\r': EMITQ(); ch
= 'r'; break;
159 case '\t': EMITQ(); ch
= 't'; break;
160 case '\v': EMITQ(); ch
= 'v'; break;
162 case '\\': /* fallthru */
163 case '"': EMITQ(); break;
167 EMIT(((ch
>> 6) & 03) + '0');
168 EMIT(((ch
>> 3) & 07) + '0');
169 ch
= (ch
& 07) + '0';
180 return needquote
? count
: 0;
183 int quote_c_style(const char *name
, char *outbuf
, FILE *outfp
, int no_dq
)
185 int cnt
= strlen(name
);
186 return quote_c_style_counted(name
, cnt
, outbuf
, outfp
, no_dq
);
190 * C-style name unquoting.
192 * Quoted should point at the opening double quote. Returns
193 * an allocated memory that holds unquoted name, which the caller
194 * should free when done. Updates endp pointer to point at
195 * one past the ending double quote if given.
198 char *unquote_c_style(const char *quoted
, const char **endp
)
201 char *name
= NULL
, *outp
= NULL
;
202 int count
= 0, ch
, ac
;
205 #define EMIT(c) (outp ? (*outp++ = (c)) : (count++))
207 if (*quoted
++ != '"')
211 /* first pass counts and allocates, second pass fills */
212 for (sp
= quoted
; (ch
= *sp
++) != '"'; ) {
214 switch (ch
= *sp
++) {
215 case 'a': ch
= '\a'; break;
216 case 'b': ch
= '\b'; break;
217 case 'f': ch
= '\f'; break;
218 case 'n': ch
= '\n'; break;
219 case 'r': ch
= '\r'; break;
220 case 't': ch
= '\t'; break;
221 case 'v': ch
= '\v'; break;
224 break; /* verbatim */
235 ac
= ((ch
- '0') << 6);
236 if ((ch
= *sp
++) < '0' || '7' < ch
)
238 ac
|= ((ch
- '0') << 3);
239 if ((ch
= *sp
++) < '0' || '7' < ch
)
245 return NULL
; /* malformed */
257 outp
= name
= xmalloc(count
+ 1);
261 void write_name_quoted(const char *prefix
, int prefix_len
,
262 const char *name
, int quote
, FILE *out
)
269 fprintf(out
, "%.*s", prefix_len
, prefix
);
276 needquote
= quote_c_style_counted(prefix
, prefix_len
,
279 needquote
= quote_c_style(name
, NULL
, NULL
, 0);
283 quote_c_style_counted(prefix
, prefix_len
,
285 quote_c_style(name
, NULL
, out
, 1);