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---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: curl_easy_option_next
Section: 3
Source: libcurl
See-also:
- curl_easy_option_by_id (3)
- curl_easy_option_by_name (3)
- curl_easy_setopt (3)
Protocol:
- All
Added-in: 7.73.0
---
# NAME
curl_easy_option_next - iterate over easy setopt options
# SYNOPSIS
~~~c
#include <curl/curl.h>
const struct curl_easyoption *
curl_easy_option_next(const struct curl_easyoption *prev);
~~~
# DESCRIPTION
This function returns a pointer to the first or the next *curl_easyoption*
struct, providing an ability to iterate over all known options for
curl_easy_setopt(3) in this instance of libcurl.
Pass a **NULL** argument as **prev** to get the first option returned, or
pass in the current option to get the next one returned. If there is no more
option to return, curl_easy_option_next(3) returns NULL.
The options returned by this functions are the ones known to this libcurl and
information about what argument type they want.
If the **CURLOT_FLAG_ALIAS** bit is set in the flags field, it means the
name is provided for backwards compatibility as an alias.
# struct
~~~c
typedef enum {
CURLOT_LONG, /* long (a range of values) */
CURLOT_VALUES, /* (a defined set or bitmask) */
CURLOT_OFF_T, /* curl_off_t (a range of values) */
CURLOT_OBJECT, /* pointer (void *) */
CURLOT_STRING, /* (char * to null-terminated buffer) */
CURLOT_SLIST, /* (struct curl_slist *) */
CURLOT_CBPTR, /* (void * passed as-is to a callback) */
CURLOT_BLOB, /* blob (struct curl_blob *) */
CURLOT_FUNCTION /* function pointer */
} curl_easytype;
/* The CURLOPTTYPE_* id ranges can still be used to figure out what type/size
to use for curl_easy_setopt() for the given id */
struct curl_easyoption {
const char *name;
CURLoption id;
curl_easytype type;
unsigned int flags;
};
~~~
# %PROTOCOLS%
# EXAMPLE
~~~c
int main(void)
{
/* iterate over all available options */
const struct curl_easyoption *opt;
opt = curl_easy_option_next(NULL);
while(opt) {
printf("Name: %s\n", opt->name);
opt = curl_easy_option_next(opt);
}
}
~~~
# %AVAILABILITY%
# RETURN VALUE
A pointer to the *curl_easyoption* struct for the next option or NULL if
no more options.
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