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MFC: tail: Do not trust st_size if it equals zero.

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PR:		bin/276107

(cherry picked from commit 1fb3caee72241b9b4dacbfb0109c972a86d4401f)
This commit is contained in:
Ricardo Branco 2024-01-03 21:32:47 +01:00 committed by Xin LI
parent 538bf98c7c
commit 1c6b4a0f3e
1 changed files with 3 additions and 3 deletions
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6
usr.bin/tail/forward.c
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@ -105,7 +105,7 @@ forward(FILE *fp, const char *fn, enum STYLE style, off_t off, struct stat *sbp)
case FBYTES:
if (off == 0)
break;
if (S_ISREG(sbp->st_mode)) {
if (S_ISREG(sbp->st_mode) && sbp->st_size > 0) {
if (sbp->st_size < off)
off = sbp->st_size;
if (fseeko(fp, off, SEEK_SET) == -1) {
@ -137,7 +137,7 @@ forward(FILE *fp, const char *fn, enum STYLE style, off_t off, struct stat *sbp)
}
break;
case RBYTES:
if (S_ISREG(sbp->st_mode)) {
if (S_ISREG(sbp->st_mode) && sbp->st_size > 0) {
if (sbp->st_size >= off &&
fseeko(fp, -off, SEEK_END) == -1) {
ierr(fn);
@ -154,7 +154,7 @@ forward(FILE *fp, const char *fn, enum STYLE style, off_t off, struct stat *sbp)
return;
break;
case RLINES:
if (S_ISREG(sbp->st_mode))
if (S_ISREG(sbp->st_mode) && sbp->st_size > 0)
if (!off) {
if (fseeko(fp, (off_t)0, SEEK_END) == -1) {
ierr(fn);