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awk(1): fix append operator to avoid truncating file

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This commit is contained in:
Alex Musolino 2018-10-31 16:49:02 +10:30
parent 8e9d2434e9
commit 913be4e74a
1 changed files with 10 additions and 4 deletions
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14
sys/src/cmd/awk/run.c
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@ -1710,7 +1710,7 @@ void stdinit(void) /* in case stdin, etc., are not constants */
Biobuf *openfile(int a, char *us) Biobuf *openfile(int a, char *us)
{ {
char *s = us; char *s = us;
int i, m; int i, m, fd;
Biobuf *fp = nil; Biobuf *fp = nil;
if (*s == '\0') if (*s == '\0')
@ -1735,9 +1735,15 @@ Biobuf *openfile(int a, char *us)
if (a == GT) { if (a == GT) {
fp = Bopen(s, OWRITE); fp = Bopen(s, OWRITE);
} else if (a == APPEND) { } else if (a == APPEND) {
fp = Bopen(s, OWRITE); fd = open(s, OWRITE);
Bseek(fp, 0LL, 2); if (fd < 0)
m = GT; /* so can mix > and >> */ fd = create(s, OWRITE, 0666);
if (fd >= 0) {
fp = Bfdopen(fd, OWRITE);
if (fp != nil)
Bseek(fp, 0LL, 2);
m = GT; /* so can mix > and >> */
}
} else if (a == '|') { /* output pipe */ } else if (a == '|') { /* output pipe */
fp = popen(s, OWRITE); fp = popen(s, OWRITE);
} else if (a == LE) { /* input pipe */ } else if (a == LE) { /* input pipe */