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iio: core: Simplify iio_format_list()

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iio_format_list() has two branches in a switch statement that are almost
identical. They only differ in the stride that is used to iterate through
the item list.

Consolidate this into a common code path to simplify the code.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20201114120000.6533-2-lars@metafoo.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Lars-Peter Clausen 2020-11-14 13:00:00 +01:00 committed by Jonathan Cameron
parent eda20ba1e2
commit e08b60d352
1 changed files with 18 additions and 27 deletions
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45
drivers/iio/industrialio-core.c
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@ -715,44 +715,35 @@ static ssize_t iio_format_list(char *buf, const int *vals, int type, int length,
const char *prefix, const char *suffix)
{
ssize_t len;
int stride;
int i;
len = scnprintf(buf, PAGE_SIZE, prefix);
switch (type) {
case IIO_VAL_INT:
for (i = 0; i < length; i++) {
len += __iio_format_value(buf + len, PAGE_SIZE - len,
type, 1, &vals[i]);
if (len >= PAGE_SIZE)
return -EFBIG;
if (i < length - 1)
len += scnprintf(buf + len, PAGE_SIZE - len,
" ");
else
len += scnprintf(buf + len, PAGE_SIZE - len,
"%s\n", suffix);
if (len >= PAGE_SIZE)
return -EFBIG;
}
stride = 1;
break;
default:
for (i = 0; i < length / 2; i++) {
len += __iio_format_value(buf + len, PAGE_SIZE - len,
type, 2, &vals[i * 2]);
if (len >= PAGE_SIZE)
return -EFBIG;
if (i < length / 2 - 1)
len += scnprintf(buf + len, PAGE_SIZE - len,
" ");
else
len += scnprintf(buf + len, PAGE_SIZE - len,
"%s\n", suffix);
stride = 2;
break;
}
len = scnprintf(buf, PAGE_SIZE, prefix);
for (i = 0; i <= length - stride; i += stride) {
if (i != 0) {
len += scnprintf(buf + len, PAGE_SIZE - len, " ");
if (len >= PAGE_SIZE)
return -EFBIG;
}
len += __iio_format_value(buf + len, PAGE_SIZE - len, type,
stride, &vals[i]);
if (len >= PAGE_SIZE)
return -EFBIG;
}
len += scnprintf(buf + len, PAGE_SIZE - len, "%s\n", suffix);
return len;
}