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commit 1e9104c18019e7dc6b5590aea4b1d4f9d8ecfd56
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Author: Bruno Haible <bruno@clisp.org>
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Date: Sat Apr 7 12:21:04 2018 +0200
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Fix check of return value of fwrite().
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* src/patch.c (copy_till): Consider incomplete fwrite() write as an error.
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* src/pch.c (pch_write_line, do_ed_script): Likewise.
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diff --git a/src/patch.c b/src/patch.c
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index 1ae91d9..3fcaec5 100644
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--- a/src/patch.c
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+++ b/src/patch.c
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@@ -2,7 +2,7 @@
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/* Copyright (C) 1984, 1985, 1986, 1987, 1988 Larry Wall
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- Copyright (C) 1989-1993, 1997-1999, 2002-2003, 2006, 2009-2012 Free Software
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+ Copyright (C) 1989-1993, 1997-1999, 2002-2003, 2006, 2009-2018 Free Software
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Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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@@ -1641,7 +1641,7 @@ copy_till (struct outstate *outstate, lin lastline)
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if (size)
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{
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if ((! outstate->after_newline && putc ('\n', fp) == EOF)
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- || ! fwrite (s, sizeof *s, size, fp))
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+ || fwrite (s, sizeof *s, size, fp) < size)
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write_fatal ();
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outstate->after_newline = s[size - 1] == '\n';
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outstate->zero_output = false;
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diff --git a/src/pch.c b/src/pch.c
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index cda3dfa..79a3c99 100644
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--- a/src/pch.c
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+++ b/src/pch.c
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@@ -2279,8 +2279,11 @@ pfetch (lin line)
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bool
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pch_write_line (lin line, FILE *file)
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{
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- bool after_newline = (p_len[line] > 0) && (p_line[line][p_len[line] - 1] == '\n');
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- if (! fwrite (p_line[line], sizeof (*p_line[line]), p_len[line], file))
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+ bool after_newline =
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+ (p_len[line] > 0) && (p_line[line][p_len[line] - 1] == '\n');
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+
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+ if (fwrite (p_line[line], sizeof (*p_line[line]), p_len[line], file)
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+ < p_len[line])
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write_fatal ();
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return after_newline;
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}
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@@ -2427,13 +2430,14 @@ do_ed_script (char const *inname, char const *outname,
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ed_command_letter = get_ed_command_letter (buf);
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if (ed_command_letter) {
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if (tmpfp)
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- if (! fwrite (buf, sizeof *buf, chars_read, tmpfp))
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+ if (fwrite (buf, sizeof *buf, chars_read, tmpfp) < chars_read)
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write_fatal ();
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if (ed_command_letter != 'd' && ed_command_letter != 's') {
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p_pass_comments_through = true;
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while ((chars_read = get_line ()) != 0) {
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if (tmpfp)
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- if (! fwrite (buf, sizeof *buf, chars_read, tmpfp))
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+ if (fwrite (buf, sizeof *buf, chars_read, tmpfp)
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+ < chars_read)
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write_fatal ();
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if (chars_read == 2 && strEQ (buf, ".\n"))
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break;
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@@ -2448,7 +2452,7 @@ do_ed_script (char const *inname, char const *outname,
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}
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if (dry_run || skip_rest_of_patch)
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return;
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- if (fwrite ("w\nq\n", sizeof (char), (size_t) 4, tmpfp) == 0
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+ if (fwrite ("w\nq\n", sizeof (char), (size_t) 4, tmpfp) < (size_t) 4
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|| fflush (tmpfp) != 0)
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write_fatal ();
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