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test_printf: Append strings more efficiently 

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2073625

commit 507f98603607d43cb76ed39c370c4dc1ed6a94f9
Author: Matthew Wilcox (Oracle) <willy@infradead.org>
Date:   Tue, 19 Oct 2021 15:26:20 +0100

    test_printf: Append strings more efficiently

    Use scnprintf instead of snprintf + strlen.

    Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    Reviewed-by: Petr Mladek <pmladek@suse.com>
    Reviewed-by: Yafang Shao <laoar.shao@gmail.com>
    Signed-off-by: Petr Mladek <pmladek@suse.com>
    Link: https://lore.kernel.org/r/20211019142621.2810043-5-willy@infradead.org

Signed-off-by: Waiman Long <longman@redhat.com>
This commit is contained in:
Waiman Long 2022-04-08 21:09:33 -04:00
parent abccd95b35
commit 3a443a9a16
1 changed files with 7 additions and 11 deletions
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18
lib/test_printf.c
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@ -614,8 +614,7 @@ page_flags_test(int section, int node, int zone, int last_cpupid,
int i; int i;
if (flags & PAGEFLAGS_MASK) { if (flags & PAGEFLAGS_MASK) {
snprintf(cmp_buf + size, BUF_SIZE - size, "%s", name); size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
size = strlen(cmp_buf);
append = true; append = true;
} }
@ -623,17 +622,14 @@ page_flags_test(int section, int node, int zone, int last_cpupid,
if (!pft[i].width) if (!pft[i].width)
continue; continue;
if (append) { if (append)
snprintf(cmp_buf + size, BUF_SIZE - size, "|"); size += scnprintf(cmp_buf + size, BUF_SIZE - size, "|");
size = strlen(cmp_buf);
}
flags |= (values[i] & pft[i].mask) << pft[i].shift; flags |= (values[i] & pft[i].mask) << pft[i].shift;
snprintf(cmp_buf + size, BUF_SIZE - size, "%s=", pft[i].name); size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s=",
size = strlen(cmp_buf); pft[i].name);
snprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt, size += scnprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
values[i] & pft[i].mask); values[i] & pft[i].mask);
size = strlen(cmp_buf);
append = true; append = true;
} }