61 lines
1.1 KiB
Markdown
61 lines
1.1 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: curl_getenv
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Section: 3
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Source: libcurl
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See-also:
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- getenv (3C)
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Protocol:
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- All
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Added-in: 7.1
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---
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# NAME
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curl_getenv - return value for environment name
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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char *curl_getenv(const char *name);
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~~~
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# DESCRIPTION
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curl_getenv() is a portable wrapper for the getenv() function, meant to
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emulate its behavior and provide an identical interface for all operating
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systems libcurl builds on (including Windows).
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You must curl_free(3) the returned string when you are done with it.
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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char *width = curl_getenv("COLUMNS");
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if(width) {
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/* it was set! */
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curl_free(width);
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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A pointer to a null-terminated string or NULL if it failed to find the
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specified name.
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# NOTE
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Under Unix operating systems, there is no point in returning an allocated
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memory, although other systems does not work properly if this is not done. The
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Unix implementation thus suffers slightly from the drawbacks of other systems.
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