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ash: memalloc: Add growstackto helper

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Upstream commit:

    Date: Sat, 19 May 2018 02:39:46 +0800
    memalloc: Add growstackto helper

    This patch adds the growstackto helper which repeatedly calls
    growstackblock until the requested size is reached.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2020-02-17 15:59:08 +01:00
parent 74aaf05170
commit c55847fedb
1 changed files with 12 additions and 17 deletions
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29
shell/ash.c
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@ -1740,6 +1740,15 @@ growstackstr(void)
return (char *)stackblock() + len;
}
static char *
growstackto(size_t len)
{
while (stackblocksize() < len)
growstackblock();
return stackblock();
}
/*
* Called from CHECKSTRSPACE.
*/
@ -1747,18 +1756,8 @@ static char *
makestrspace(size_t newlen, char *p)
{
size_t len = p - g_stacknxt;
size_t size;
for (;;) {
size_t nleft;
size = stackblocksize();
nleft = size - len;
if (nleft >= newlen)
break;
growstackblock();
}
return (char *)stackblock() + len;
return growstackto(len + newlen) + len;
}
static char *
@ -2584,9 +2583,7 @@ path_advance(const char **path, const char *name)
for (p = start; *p && *p != ':' && *p != '%'; p++)
continue;
len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
while (stackblocksize() < len)
growstackblock();
q = stackblock();
q = growstackto(len);
if (p != start) {
q = mempcpy(q, start, p - start);
*q++ = '/';
@ -12836,9 +12833,7 @@ parsebackq: {
/* Ignore any pushed back tokens left from the backquote parsing. */
if (oldstyle)
tokpushback = 0;
while (stackblocksize() <= savelen)
growstackblock();
STARTSTACKSTR(out);
out = growstackto(savelen + 1);
if (str) {
memcpy(out, str, savelen);
STADJUST(savelen, out);