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util: bitmap: Unify parsing of bitmaps

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There were two separate instances of string->virBitmap code:
virBitmapParseInternal and virBitmapParseUnlimited.

By adding a flag to switch to expanding APIs we can merge the two
implementations into one.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2021-12-06 16:28:44 +01:00
parent 515672c0d9
commit f33c86be1d
1 changed files with 26 additions and 89 deletions
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115
src/util/virbitmap.c
View File

@ -367,6 +367,7 @@ virBitmapFormat(virBitmap *bitmap)
* virBitmapParseInternal:
* @str: points to a string representing a human-readable bitmap
* @bitmap: a bitmap populated from @str
* @limited: Don't use self-expanding APIs, report error if bit exceeds bitmap size
*
* This function is the counterpart of virBitmapFormat. This function creates
* a bitmap, in which bits are set according to the content of @str.
@ -379,7 +380,8 @@ virBitmapFormat(virBitmap *bitmap)
*/
static int
virBitmapParseInternal(const char *str,
virBitmap *bitmap)
virBitmap *bitmap,
bool limited)
{
bool neg = false;
const char *cur = str;
@ -421,11 +423,19 @@ virBitmapParseInternal(const char *str,
if (*cur == ',' || *cur == 0) {
if (neg) {
if (virBitmapClearBit(bitmap, start) < 0)
goto error;
if (limited) {
if (virBitmapClearBit(bitmap, start) < 0)
goto error;
} else {
virBitmapClearBitExpand(bitmap, start);
}
} else {
if (virBitmapSetBit(bitmap, start) < 0)
goto error;
if (limited) {
if (virBitmapSetBit(bitmap, start) < 0)
goto error;
} else {
virBitmapSetBitExpand(bitmap, start);
}
}
} else if (*cur == '-') {
if (neg)
@ -442,8 +452,12 @@ virBitmapParseInternal(const char *str,
cur = tmp;
for (i = start; i <= last; i++) {
if (virBitmapSetBit(bitmap, i) < 0)
goto error;
if (limited) {
if (virBitmapSetBit(bitmap, i) < 0)
goto error;
} else {
virBitmapSetBitExpand(bitmap, i);
}
}
virSkipSpaces(&cur);
@ -491,7 +505,7 @@ virBitmapParse(const char *str,
{
g_autoptr(virBitmap) tmp = virBitmapNew(bitmapSize);
if (virBitmapParseInternal(str, tmp) < 0)
if (virBitmapParseInternal(str, tmp, true) < 0)
return -1;
*bitmap = g_steal_pointer(&tmp);
@ -518,89 +532,12 @@ virBitmapParse(const char *str,
virBitmap *
virBitmapParseUnlimited(const char *str)
{
virBitmap *bitmap = virBitmapNew(0);
bool neg = false;
const char *cur = str;
char *tmp;
size_t i;
int start, last;
g_autoptr(virBitmap) tmp = virBitmapNew(0);
if (!str)
goto error;
if (virBitmapParseInternal(str, tmp, false) < 0)
return NULL;
virSkipSpaces(&cur);
if (*cur == '\0')
goto error;
while (*cur != 0) {
/*
* 3 constructs are allowed:
* - N : a single CPU number
* - N-M : a range of CPU numbers with N < M
* - ^N : remove a single CPU number from the current set
*/
if (*cur == '^') {
cur++;
neg = true;
}
if (!g_ascii_isdigit(*cur))
goto error;
if (virStrToLong_i(cur, &tmp, 10, &start) < 0)
goto error;
if (start < 0)
goto error;
cur = tmp;
virSkipSpaces(&cur);
if (*cur == ',' || *cur == 0) {
if (neg) {
virBitmapClearBitExpand(bitmap, start);
} else {
virBitmapSetBitExpand(bitmap, start);
}
} else if (*cur == '-') {
if (neg)
goto error;
cur++;
virSkipSpaces(&cur);
if (virStrToLong_i(cur, &tmp, 10, &last) < 0)
goto error;
if (last < start)
goto error;
cur = tmp;
for (i = start; i <= last; i++)
virBitmapSetBitExpand(bitmap, i);
virSkipSpaces(&cur);
}
if (*cur == ',') {
cur++;
virSkipSpaces(&cur);
neg = false;
} else if (*cur == 0) {
break;
} else {
goto error;
}
}
return bitmap;
error:
virReportError(VIR_ERR_INVALID_ARG,
_("Failed to parse bitmap '%s'"), NULLSTR(str));
virBitmapFree(bitmap);
return NULL;
return g_steal_pointer(&tmp);
}