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glib: add parameter annotations for g_vasprintf and callers

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Document that g_vasprintf and g_strdup_printf are guaranteed to return a
non-NULL string, unless the format string contains the locale sensitive
conversions %lc or %ls.

Further annotate that the output parameter for g_vasprintf and the
format string for all functions must be non-NULL.

Fixes #1622

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2019-10-04 15:04:01 +01:00
parent 14035010dd
commit 109be1e90d
3 changed files with 18 additions and 6 deletions
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8
glib/gprintf.c
View File

@ -295,8 +295,8 @@ g_vsnprintf (gchar *string,
/**
* g_vasprintf:
* @string: the return location for the newly-allocated string.
* @format: a standard printf() format string, but notice
* @string: (not optional) (nullable): the return location for the newly-allocated string.
* @format: (not nullable): a standard printf() format string, but notice
* [string precision pitfalls][string-precision]
* @args: the list of arguments to insert in the output.
*
@ -306,6 +306,10 @@ g_vsnprintf (gchar *string,
* string to hold the output, instead of putting the output in a buffer
* you allocate in advance.
*
* The returned value in @string is guaranteed to be non-NULL, unless
* @format contains `%lc` or `%ls` conversions, which can fail if no
* multibyte representation is available for the given character.
*
* `glib/gprintf.h` must be explicitly included in order to use this function.
*
* Returns: the number of bytes printed.

12
glib/gstrfuncs.c
View File

@ -491,7 +491,7 @@ g_stpcpy (gchar *dest,
/**
* g_strdup_vprintf:
* @format: a standard printf() format string, but notice
* @format: (not nullable): a standard printf() format string, but notice
* [string precision pitfalls][string-precision]
* @args: the list of parameters to insert into the format string
*
@ -500,6 +500,10 @@ g_stpcpy (gchar *dest,
* the result. The returned string should be freed with g_free() when
* no longer needed.
*
* The returned string is guaranteed to be non-NULL, unless @format
* contains `%lc` or `%ls` conversions, which can fail if no multibyte
* representation is available for the given character.
*
* See also g_vasprintf(), which offers the same functionality, but
* additionally returns the length of the allocated string.
*
@ -518,7 +522,7 @@ g_strdup_vprintf (const gchar *format,
/**
* g_strdup_printf:
* @format: a standard printf() format string, but notice
* @format: (not nullable): a standard printf() format string, but notice
* [string precision pitfalls][string-precision]
* @...: the parameters to insert into the format string
*
@ -527,6 +531,10 @@ g_strdup_vprintf (const gchar *format,
* the result. The returned string should be freed with g_free() when no
* longer needed.
*
* The returned string is guaranteed to be non-NULL, unless @format
* contains `%lc` or `%ls` conversions, which can fail if no multibyte
* representation is available for the given character.
*
* Returns: a newly-allocated string holding the result
*/
gchar*

4
glib/gstring.c
View File

@ -1144,7 +1144,7 @@ g_string_up (GString *string)
/**
* g_string_append_vprintf:
* @string: a #GString
* @format: the string format. See the printf() documentation
* @format: (not nullable): the string format. See the printf() documentation
* @args: the list of arguments to insert in the output
*
* Appends a formatted string onto the end of a #GString.
@ -1179,7 +1179,7 @@ g_string_append_vprintf (GString *string,
/**
* g_string_vprintf:
* @string: a #GString
* @format: the string format. See the printf() documentation
* @format: (not nullable): the string format. See the printf() documentation
* @args: the parameters to insert into the format string
*
* Writes a formatted string into a #GString.