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Fix snprintf test.

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C99 allows for the Single Unix Spec semantics which prescribe a return
value of -1 for n == 0 which is treated as an encoding error.
This reenables use of snprintf on Solaris at least.

Relevant excerpts from ection 7.19.6.5:

    Description

    [..] If n is zero, nothing is written, and s may be a null pointer. [..]

    Returns

    The snprintf function returns the number of characters that would have been
    written had n been sufficiently large, not counting the terminating null
    character, or a negative value if an encoding error occurred.

Single Unix Spec:

http://www.opengroup.org/onlinepubs/007908799/xsh/fprintf.html
This commit is contained in:
Sascha Schumann
2003-06-28 12:29:07 +00:00
parent 0e29833fc7
commit 52bdfd3dca
1 changed files with 3 additions and 1 deletions
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acinclude.m4
+3 -1
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@@ -1186,7 +1186,9 @@ main() {
int res = 0;
res = res || (snprintf(buf, 2, "marcus") != 6);
res = res || (buf[1] != '\0');
res = res || (snprintf(buf, 0, "boerger") != 7);
/* Implementations may consider this as an encoding error */
snprintf(buf, 0, "boerger");
/* However, they MUST ignore the pointer */
res = res || (buf[0] != 'm');
res = res || (snprintf(NULL, 0, "boerger") != 7);
res = res || (snprintf(buf, sizeof(buf), "%f", 0.12345678) != 8);