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plurals

PO
primarykey
Id
7150017
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-08-22T15:45:48.593
FavoriteCount
0
LastActivityDate
2012-09-20T18:22:32.367
LastEditDate
2017-05-23T11:47:56.107
LastEditorUserId
-1
OwnerUserId
429091
ParentId
7147700
PostTypeId
2
Score
1
ViewCount
0
LastEditorDisplayName
text
Body
As the other answer already states, passing <code>ap</code> to a v*() function leaves <code>ap</code> in an undetermined state. So, the solution is to not depend on this state. I suggest an alternative workaround. First, initialize ap as normal. Then determine the length of the first formatted string using <code>vsnprintf(NULL, 0, fstra, ap)</code>. Concatenate the format strings, reinitialize <code>ap</code>, and split the output using the predetermined length of the first formatted string. It should look something like the following: <pre><code>void test(const char* fstra, const char* fstrb, ...) { char *format, *buf; char *a, *b; int a_len, buf_len; va_list ap; va_start(ap, fstrb); a_len = vsnprintf(NULL, 0, fstra, ap); va_end(ap); asprintf(&format, "%s%s", fstra, fstrb); va_start(ap, fstrb); buf_len = vasprintf(&buf, format, ap); va_end(ap); free(format); a = malloc(a_len + 1); memcpy(a, buf, a_len); a[a_len] = '\0'; b = malloc(buf_len - a_len + 1); memcpy(b, buf + a_len, buf_len - a_len); b[buf_len - a_len] = '\0'; free(buf); } </code></pre> As also discussed in <a href="https://stackoverflow.com/a/7147733/429091">the other answer</a>, this approach does not separate positional <code>printf</code>-style placeholders (<code>"%1$s. I repeat, %1$s."</code>). So the documentation for the interface should clearly state that both format strings share the same positional placeholder namespace—and that if one of the format strings uses positional placeholders then both must.
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1. This table or related slice is empty.
PostParentId
1. POPassing a single argument list to two v*printf() calls
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PostTypePostTypeId
1. PTAnswer
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1. USCommunity
UserOwnerUserId
1. USbinki
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1. POPassing a single argument list to two v*printf() calls
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1. VO
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