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curl/docs/libcurl/opts/CURLOPT_WILDCARDMATCH.3
Daniel Stenberg 404c8850da
curl_fnmatch: only allow two asterisks for matching
The previous limit of 5 can still end up in situation that takes a very
long time and consumes a lot of CPU.

If there is still a rare use case for this, a user can provide their own
fnmatch callback for a version that allows a larger set of wildcards.

This commit was triggered by yet another OSS-Fuzz timeout due to this.
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=8369

Closes #2587
2018-05-18 23:33:44 +02:00

88 lines
3.3 KiB
Groff

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.TH CURLOPT_WILDCARDMATCH 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_WILDCARDMATCH \- enable directory wildcard transfers
.SH SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WILDCARDMATCH, long onoff);
.SH DESCRIPTION
Set \fIonoff\fP to 1 if you want to transfer multiple files according to a
file name pattern. The pattern can be specified as part of the
\fICURLOPT_URL(3)\fP option, using an fnmatch-like pattern (Shell Pattern
Matching) in the last part of URL (file name).
By default, libcurl uses its internal wildcard matching implementation. You
can provide your own matching function by the
\fICURLOPT_FNMATCH_FUNCTION(3)\fP option.
A brief introduction of its syntax follows:
.RS
.IP "* - ASTERISK"
\&ftp://example.com/some/path/\fB*.txt\fP (for all txt's from the root
directory). Only two asterisks are allowed within the same pattern string.
.RE
.RS
.IP "? - QUESTION MARK"
Question mark matches any (exactly one) character.
\&ftp://example.com/some/path/\fBphoto?.jpeg\fP
.RE
.RS
.IP "[ - BRACKET EXPRESSION"
The left bracket opens a bracket expression. The question mark and asterisk have
no special meaning in a bracket expression. Each bracket expression ends by the
right bracket and matches exactly one character. Some examples follow:
\fB[a-zA-Z0\-9]\fP or \fB[f\-gF\-G]\fP \- character interval
\fB[abc]\fP - character enumeration
\fB[^abc]\fP or \fB[!abc]\fP - negation
\fB[[:\fP\fIname\fP\fB:]]\fP class expression. Supported classes are
\fBalnum\fP,\fBlower\fP, \fBspace\fP, \fBalpha\fP, \fBdigit\fP, \fBprint\fP,
\fBupper\fP, \fBblank\fP, \fBgraph\fP, \fBxdigit\fP.
\fB[][-!^]\fP - special case \- matches only '\-', ']', '[', '!' or '^'. These
characters have no special purpose.
\fB[\\[\\]\\\\]\fP - escape syntax. Matches '[', ']' or '\\'.
Using the rules above, a file name pattern can be constructed:
\&ftp://example.com/some/path/\fB[a-z[:upper:]\\\\].jpeg\fP
.RE
.PP
.SH PROTOCOLS
This feature is only supported for FTP download.
.SH EXAMPLE
See https://curl.haxx.se/libcurl/c/ftp-wildcard.html
.SH AVAILABILITY
Added in 7.21.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_FNMATCH_FUNCTION "(3), " CURLOPT_URL "(3), "