diff options
Diffstat (limited to 'nsprpub/pr/include/prenv.h')
-rw-r--r-- | nsprpub/pr/include/prenv.h | 52 |
1 files changed, 26 insertions, 26 deletions
diff --git a/nsprpub/pr/include/prenv.h b/nsprpub/pr/include/prenv.h index 468c7d596..550f05c93 100644 --- a/nsprpub/pr/include/prenv.h +++ b/nsprpub/pr/include/prenv.h @@ -18,18 +18,18 @@ PR_BEGIN_EXTERN_C /* ** PR_GetEnv() -- Retrieve value of environment variable -** +** ** Description: ** PR_GetEnv() is modeled on Unix getenv(). -** -** -** Inputs: +** +** +** Inputs: ** var -- The name of the environment variable -** +** ** Returns: ** The value of the environment variable 'var' or NULL if ** the variable is undefined. -** +** ** Restrictions: ** You'd think that a POSIX getenv(), putenv() would be ** consistently implemented everywhere. Surprise! It is not. On @@ -42,33 +42,33 @@ PR_BEGIN_EXTERN_C ** un-set; a subsequent call to getenv() returns NULL. On ** other platforms, a subsequent call to getenv() returns a ** pointer to a null-string (a byte of zero). -** -** PR_GetEnv(), PR_SetEnv() provide a consistent behavior +** +** PR_GetEnv(), PR_SetEnv() provide a consistent behavior ** across all supported platforms. There are, however, some ** restrictions and some practices you must use to achieve ** consistent results everywhere. -** +** ** When manipulating the environment there is no way to un-set ** an environment variable across all platforms. We suggest ** you interpret the return of a pointer to null-string to ** mean the same as a return of NULL from PR_GetEnv(). -** +** ** A call to PR_SetEnv() where the parameter is of the form ** "name" will return PR_FAILURE; the environment remains ** unchanged. A call to PR_SetEnv() where the parameter is ** of the form "name=" may un-set the envrionment variable on ** some platforms; on others it may set the value of the ** environment variable to the null-string. -** +** ** For example, to test for NULL return or return of the ** null-string from PR_GetEnv(), use the following code ** fragment: -** +** ** char *val = PR_GetEnv("foo"); -** if ((NULL == val) || ('\0' == *val)) { -** ... interpret this as un-set ... +** if ((NULL == val) || ('\0' == *val)) { +** ... interpret this as un-set ... ** } -** +** ** The caller must ensure that the string passed ** to PR_SetEnv() is persistent. That is: The string should ** not be on the stack, where it can be overwritten @@ -77,16 +77,16 @@ PR_BEGIN_EXTERN_C ** overwritten by other actions of the process. ... Some ** platforms use the string by reference rather than copying ** it into the environment space. ... You have been warned! -** +** ** Use of platform-native functions that manipulate the -** environment (getenv(), putenv(), +** environment (getenv(), putenv(), ** SetEnvironmentVariable(), etc.) must not be used with ** NSPR's similar functions. The platform-native functions ** may not be thread safe and/or may operate on different ** conceptual environment space than that operated upon by ** NSPR's functions or other environment manipulating ** functions on the same platform. (!) -** +** */ NSPR_API(char*) PR_GetEnv(const char *var); @@ -106,24 +106,24 @@ NSPR_API(char*) PR_GetEnvSecure(const char *var); /* ** PR_SetEnv() -- set, unset or change an environment variable -** +** ** Description: ** PR_SetEnv() is modeled on the Unix putenv() function. -** -** Inputs: +** +** Inputs: ** string -- pointer to a caller supplied ** constant, persistent string of the form name=value. Where ** name is the name of the environment variable to be set or ** changed; value is the value assigned to the variable. ** -** Returns: +** Returns: ** PRStatus. -** -** Restrictions: +** +** Restrictions: ** See the Restrictions documented in the description of ** PR_GetEnv() in this header file. -** -** +** +** */ NSPR_API(PRStatus) PR_SetEnv(const char *string); |