On Thu, Feb 23, 2017 at 04:26:56PM +0100, Pavel Hrdina wrote:
Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx> --- cfg.mk | 2 +- src/libvirt_private.syms | 2 ++ src/util/virstring.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++ src/util/virstring.h | 27 +++++++++++++++++++ tests/virstringtest.c | 49 +++++++++++++++++++++++++++++++++ 5 files changed, 149 insertions(+), 1 deletion(-) diff --git a/cfg.mk b/cfg.mk index aaba61f1dc..22c655eac6 100644 --- a/cfg.mk +++ b/cfg.mk @@ -1147,7 +1147,7 @@ exclude_file_name_regexp--sc_prohibit_fork_wrappers = \ exclude_file_name_regexp--sc_prohibit_gethostname = ^src/util/virutil\.c$$ exclude_file_name_regexp--sc_prohibit_internal_functions = \ - ^src/(util/(viralloc|virutil|virfile)\.[hc]|esx/esx_vi\.c)$$ + ^src/(util/(viralloc|virutil|virfile|virstring)\.[hc]|esx/esx_vi\.c)$$ exclude_file_name_regexp--sc_prohibit_newline_at_end_of_diagnostic = \ ^src/rpc/gendispatch\.pl$$ diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 07a35333b1..e9c4d73779 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -2502,6 +2502,8 @@ virAsprintfInternal; virSkipSpaces; virSkipSpacesAndBackslash; virSkipSpacesBackwards; +virStrcat; +virStrcatInplace; virStrcpy; virStrdup; virStringBufferIsPrintable; diff --git a/src/util/virstring.c b/src/util/virstring.c index 69abc267bf..bc15ce7e9e 100644 --- a/src/util/virstring.c +++ b/src/util/virstring.c @@ -837,6 +837,76 @@ virStrndup(char **dest, } +/** + * virStrcat + * @dest: where to store concatenated string + * @src: the source string to append to @dest + * @inPlace: false if we should expand the allocated memory before moving, + * true if we should assume someone else has already done that.
This is here probably from some work in progress version.
+ * @report: whether to report OOM error, if there is one
+ * @domcode: error domain code
+ * @filename: caller's filename
+ * @funcname: caller's funcname
+ * @linenr: caller's line number
+ *
+ * Wrapper over strcat, which reports OOM error if told so,
+ * in which case callers wants to pass @domcode, @filename,
+ * @funcname and @linenr which should represent location in
+ * caller's body where virStrcat is called from. Consider
+ * using VIR_STRCAT which sets these automatically.
+ *
+ * Returns: 0 for NULL src, 1 on successful concatenate, -1 otherwise.
+ */
+int
+virStrcat(char **dest,
+ const char *src,
+ bool report,
+ int domcode,
+ const char *filename,
+ const char *funcname,
+ size_t linenr)
+{
+ size_t dest_len = 0;
+ size_t src_len = 0;
+
+ if (!src)
+ return 0;
+
+ if (*dest)
+ dest_len = strlen(*dest);
+ src_len = strlen(src);
+
+ if (virReallocN(dest, sizeof(*dest), dest_len + src_len + 1,
+ report, domcode, filename, funcname, linenr) < 0)
+ return -1;
+
+ strcat(*dest, src);
+
+ return 1;
+}
+
+
+/**
+ * virStrcat
+ * @dest: where to store concatenated string
+ * @src: the source string to append to @dest
+ *
+ * Wrapper over strcat, which properly handles if @src is NULL.
+ *
+ * Returns: 0 for NULL src, 1 on successful concatenate.
+ */
Really? This whole wrapper just for checking NULL? So instead of: if (x) strcat (y, x) I should do: VIR_STRCAT_INPLACE(y, x) now? It's not even saving any characters. Plus, is there *really* any occurrence of strcat that might be called with NULL? I would say that such code has more logic problems in that case. The reallocating strcat makes sense, but the name is *really* confusing for people who are used to what strcat/strncat does. So while I see how that might be useful, we also have a buffer for more interesting dynamic string modifications and I'm not sure this is something that will help a lot.
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