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-.\" -*-nroff-*-
-.TH env 3 "26 July 1999" mLib
-.SH "NAME"
-env \- efficient fiddling with environment variables
-.\" @env_get
-.\" @env_put
-.\" @env_import
-.\" @env_export
-.\" @env_destroy
-.SH "SYNOPSIS"
-.nf
-.B "#include <mLib/env.h>"
-
-.BI "char *env_get(sym_table *" t ", const char *" name );
-.BI "void env_put(sym_table *" t ,
-.BI "             const char *" name ", const char *" value );
-.BI "void env_import(sym_table *" t ", char **" env );
-.BI "char **env_export(sym_table *" t );
-.fi
-.SH "DESCRIPTION"
-The functions in the
-.B "<mLib/env.h>"
-header manipulate environment variables stored in a hash table.
-.PP
-The function
-.B env_import
-reads a standard Unix environment array and stores the variables in the
-symbol table.  (A standard Unix environment array is an array of
-pointers to strings of the form
-.IB name = value
-terminated by a null pointer.  This format is used for the global
-.B environ
-variable, and by the
-.BR execve (2)
-function.)  The symbol table must have already been created (see
-.BR sym_create (3)).
-.PP
-The function
-.B env_export
-creates a Unix environment array from a symbol table.  The environment
-array is one big block of memory allocated using
-.BR malloc (3);
-hence, one call to
-.BR free (3)
-releases all the memory used for the pointer array and the strings.
-.PP
-The
-.B env_get
-function looks up a variable in an environment symbol table.  The
-returned result is the variable's value if it exists, or a null pointer
-if not.
-.PP
-The
-.B env_put
-function sets or deletes environment variables.  If the
-.I name
-argument contains an
-.RB ` = '
-character, it is assumed to be of the form
-.IB n = v\fR;
-the
-.I value argument is ignored, and the variable
-.I n
-is assigned the value
-.IR v .
-Otherwise, if
-.I value
-is not a null pointer, the variable
-.I name
-is assigned the value
-.I value .
-Finally, if
-.I value
-is null, the variable
-.I name
-is deleted.
-.PP
-The
-.B env_destroy
-function frees all the memory used by an environment symbol table.  The
-table itself is destroyed too.
-.SH "SEE ALSO"
-.BR sym (3),
-.BR mLib (3).
-.SH "AUTHOR"
-Mark Wooding, <mdw@nsict.org>