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sh: Simplify handling of newlines in command substitution.

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Unless we need to split on newlines, just append them as normal and remove
them at the end.
This commit is contained in:
Jilles Tjoelker 2017-04-28 16:16:22 +00:00
parent b6ecf43450
commit d4993b6db2
1 changed files with 17 additions and 22 deletions
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39
bin/sh/expand.c
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@ -462,6 +462,7 @@ expbackq(union node *cmd, int quoted, int flag, struct worddest *dst)
int quotes = flag & (EXP_GLOB | EXP_CASE);
size_t nnl;
const char *ifs;
int startloc;
INTOFF;
p = grabstackstr(dest);
@ -469,6 +470,7 @@ expbackq(union node *cmd, int quoted, int flag, struct worddest *dst)
ungrabstackstr(p, dest);
p = in.buf;
startloc = dest - stackblock();
nnl = 0;
if (!quoted && flag & EXP_SPLIT)
ifs = ifsset() ? ifsval() : " \t\n";
@ -490,31 +492,24 @@ expbackq(union node *cmd, int quoted, int flag, struct worddest *dst)
lastc = *p++;
if (lastc == '\0')
continue;
if (lastc == '\n') {
nnl++;
} else {
if (nnl > 0) {
if (strchr(ifs, '\n') != NULL) {
NEXTWORD('\n', flag, dest, dst);
nnl = 0;
} else {
CHECKSTRSPACE(nnl + 2, dest);
while (nnl > 0) {
nnl--;
USTPUTC('\n', dest);
}
}
}
if (strchr(ifs, lastc) != NULL)
if (nnl > 0 && lastc != '\n') {
NEXTWORD('\n', flag, dest, dst);
nnl = 0;
}
if (strchr(ifs, lastc) != NULL) {
if (lastc == '\n')
nnl++;
else
NEXTWORD(lastc, flag, dest, dst);
else {
CHECKSTRSPACE(2, dest);
if (quotes && syntax[(int)lastc] == CCTL)
USTPUTC(CTLESC, dest);
USTPUTC(lastc, dest);
}
} else {
CHECKSTRSPACE(2, dest);
if (quotes && syntax[(int)lastc] == CCTL)
USTPUTC(CTLESC, dest);
USTPUTC(lastc, dest);
}
}
while (dest > stackblock() + startloc && STTOPC(dest) == '\n')
STUNPUTC(dest);
if (in.fd >= 0)
close(in.fd);