download.c File Reference

Fun VM opcode snippet: HTTP download to file via libcurl (OP_CURL_DOWNLOAD). More...

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Go to the source code of this file.

Functions
	free_value (vurl)
	free_value (vpath)
	if (!url||!path)
	if (!fp)
	curl_easy_setopt (h, CURLOPT_URL, url)
	curl_easy_setopt (h, CURLOPT_FOLLOWLOCATION, 1L)
	curl_easy_setopt (h, CURLOPT_WRITEFUNCTION, fun_curl_file_write_cb)
	curl_easy_setopt (h, CURLOPT_WRITEDATA, fp)
	curl_easy_cleanup (h)
	fclose (fp)
	free (url)
	free (path)
	if (rc !=CURLE_OK)
	push_value (vm, make_int(1))

Variables
case	OP_CURL_DOWNLOAD
Value	vurl = pop_value(vm)
char *	url = value_to_string_alloc(&vurl)
char *	path = value_to_string_alloc(&vpath)
FILE *	fp = fopen(path, "wb")
CURL *	h = curl_easy_init()
CURLcode	rc = curl_easy_perform(h)
	break

Detailed Description

Fun VM opcode snippet: HTTP download to file via libcurl (OP_CURL_DOWNLOAD).

This snippet is included by vm.c and implements the OP_CURL_DOWNLOAD instruction. When FUN_WITH_CURL is enabled, it downloads the content at the given URL and writes it to the specified filesystem path.

Stack behavior:

• Pops: path:string, url:string (values are converted via value_to_string_alloc)
• Pushes: int (1 on success, 0 on error or when CURL is disabled)

Pops a destination path and URL, streams the HTTP response body into the file, and pushes 1 on success or 0 on any error. Without FUN_WITH_CURL, behaves as a no-op that consumes two values and pushes 0.

Error handling:

• Returns 0 if URL/path conversion fails, file open fails, CURL init or perform fails.
• Follows redirects (CURLOPT_FOLLOWLOCATION = 1L).
• Writes via fun_curl_file_write_cb directly into the opened FILE*.

Notes:

• All temporary allocations (URL, path) are freed; FILE* is closed.
• On builds without FUN_WITH_CURL, consumes two values and pushes 0.

Definition in file download.c.

Function Documentation

curl_easy_cleanup()

curl_easy_cleanup

(

h

)

curl_easy_setopt() [1/4]

curl_easy_setopt	(	h	,
		CURLOPT_FOLLOWLOCATION	,
		1L	)

curl_easy_setopt() [2/4]

curl_easy_setopt	(	h	,
		CURLOPT_URL	,
		url	)

curl_easy_setopt() [3/4]

curl_easy_setopt	(	h	,
		CURLOPT_WRITEDATA	,
		fp	)

curl_easy_setopt() [4/4]

curl_easy_setopt	(	h	,
		CURLOPT_WRITEFUNCTION	,
		fun_curl_file_write_cb	)

fclose()

fclose

(

fp

)

free() [1/2]

free

(

path

)

free() [2/2]

free

(

url

)

free_value() [1/2]

free_value

(

vpath

)

free_value() [2/2]

free_value

(

vurl

)

if() [1/3]

if

(

!

fp

)

Definition at line 53 of file download.c.

if() [2/3]

if

(

!url||!

path

)

Definition at line 46 of file download.c.

if() [3/3]

if

(

rc !

= CURLE_OK

)

Definition at line 76 of file download.c.

push_value()

push_value	(	vm	,
		make_int(1)	)

Variable Documentation

break

break

Definition at line 88 of file download.c.

fp

FILE* fp = fopen(path, "wb")

Definition at line 52 of file download.c.

h

CURL* h = curl_easy_init()

Definition at line 59 of file download.c.

OP_CURL_DOWNLOAD

case OP_CURL_DOWNLOAD

Definition at line 38 of file download.c.

path

char* path = value_to_string_alloc(&vpath)

Definition at line 43 of file download.c.

rc

void rc = curl_easy_perform(h)

Definition at line 71 of file download.c.

url

char* url = value_to_string_alloc(&vurl)

Definition at line 42 of file download.c.

vurl

Value vurl = pop_value(vm)

Definition at line 41 of file download.c.