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Fix bug when gzungetc() is used immediately after gzopen().

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This commit is contained in:
Mark Adler 2023-08-11 10:59:03 -07:00
parent c7ddcc2e0e
commit 7dd6aa7245
1 changed files with 4 additions and 0 deletions
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4
gzread.c
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@ -443,6 +443,10 @@ int ZEXPORT gzungetc(int c, gzFile file) {
return -1;
state = (gz_statep)file;
/* in case this was just opened, set up the input buffer */
if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0)
(void)gz_look(state);
/* check that we're reading and that there's no (serious) error */
if (state->mode != GZ_READ ||
(state->err != Z_OK && state->err != Z_BUF_ERROR))