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authorMark H Weaver <mhw@netris.org>2011-03-08 13:13:54 -0500
committerMark H Weaver <mhw@netris.org>2011-03-08 18:24:54 -0500
commitce3ce21c623771ecafdf80c98519e80048cfedb7 (patch)
tree3c2d1eb36685712cbfee738a9d49a2c5fe404473 /doc/ref/api-data.texi
parentddf134cfec0d82ea9f39ddd69948c08feecb9576 (diff)
downloadguile-ce3ce21c623771ecafdf80c98519e80048cfedb7.tar.gz
Improve docs of string and symbol conversions from C strings
* doc/ref/api-data.texi (Conversion to/from C): Document scm_from_latin1_string, scm_from_utf8_string, and scm_from_utf32_string. Remind readers that these functions should be used to convert C string constants, and that scm_from_locale_string is _not_ appropriate for that purpose. (Symbol Primitives): Document scm_from_latin1_symbol and scm_from_utf8_symbol. Remind readers that these functions should be used when the specified names are C string constants, and that scm_from_locale_symbol is _not_ appropriate for that purpose.
Diffstat (limited to 'doc/ref/api-data.texi')
-rw-r--r--doc/ref/api-data.texi32
1 files changed, 28 insertions, 4 deletions
diff --git a/doc/ref/api-data.texi b/doc/ref/api-data.texi
index 5bef926a9..7fa38d18a 100644
--- a/doc/ref/api-data.texi
+++ b/doc/ref/api-data.texi
@@ -4182,6 +4182,12 @@ If @var{len} is @code{(size_t)-1}, then @var{str} does need to be
null-terminated and the real length will be found with @code{strlen}.
If the C string is ill-formed, an error will be raised.
+
+Note that these functions should @emph{not} be used to convert C string
+constants, because there is no guarantee that the current locale will
+match that of the source code. To convert C string constants, use
+@code{scm_from_latin1_string}, @code{scm_from_utf8_string} or
+@code{scm_from_utf32_string}.
@end deftypefn
@deftypefn {C Function} SCM scm_take_locale_string (char *str)
@@ -4281,10 +4287,16 @@ The @var{handler} parameters suggests a strategy for dealing with
unconvertable characters.
@end deftypefn
-ISO-8859-1 is the most common 8-bit character encoding. This encoding
-is also referred to as the Latin-1 encoding. The following two
-conversion functions are provided to convert between Latin-1 C strings
-and Guile strings.
+The following conversion functions are provided as a convenience for the
+most commonly used encodings.
+
+@deftypefn {C Function} SCM scm_from_latin1_string (const char *str)
+@deftypefnx {C Function} SCM scm_from_utf8_string (const char *str)
+@deftypefnx {C Function} SCM scm_from_utf32_string (const scm_t_wchar *str)
+Return a scheme string from the null-terminated C string @var{str},
+which is ISO-8859-1-, UTF-8-, or UTF-32-encoded. These functions should
+be used to convert hard-coded C string constants into Scheme strings.
+@end deftypefn
@deftypefn {C Function} SCM scm_from_latin1_stringn (const char *str, size_t len)
@deftypefnx {C Function} SCM scm_from_utf8_stringn (const char *str, size_t len)
@@ -5218,12 +5230,24 @@ When you want to do more from C, you should convert between symbols
and strings using @code{scm_symbol_to_string} and
@code{scm_string_to_symbol} and work with the strings.
+@deffn {C Function} scm_from_latin1_symbol (const char *name)
+@deffnx {C Function} scm_from_utf8_symbol (const char *name)
+Construct and return a Scheme symbol whose name is specified by the
+null-terminated C string @var{name}. These are appropriate when
+the C string is hard-coded in the source code.
+@end deffn
+
@deffn {C Function} scm_from_locale_symbol (const char *name)
@deffnx {C Function} scm_from_locale_symboln (const char *name, size_t len)
Construct and return a Scheme symbol whose name is specified by
@var{name}. For @code{scm_from_locale_symbol}, @var{name} must be null
terminated; for @code{scm_from_locale_symboln} the length of @var{name} is
specified explicitly by @var{len}.
+
+Note that these functions should @emph{not} be used when @var{name} is a
+C string constant, because there is no guarantee that the current locale
+will match that of the source code. In such cases, use
+@code{scm_from_latin1_symbol} or @code{scm_from_utf8_symbol}.
@end deffn
@deftypefn {C Function} SCM scm_take_locale_symbol (char *str)