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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 18:35:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 18:35:28 +0000 |
commit | ea314d2f45c40a006c0104157013ab4b857f665f (patch) | |
tree | 3ef2971cb3675c318b8d9effd987854ad3f6d3e8 /lib/compat/vsnprintf.c | |
parent | Initial commit. (diff) | |
download | dpkg-ea314d2f45c40a006c0104157013ab4b857f665f.tar.xz dpkg-ea314d2f45c40a006c0104157013ab4b857f665f.zip |
Adding upstream version 1.22.4.upstream/1.22.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/compat/vsnprintf.c')
-rw-r--r-- | lib/compat/vsnprintf.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/lib/compat/vsnprintf.c b/lib/compat/vsnprintf.c new file mode 100644 index 0000000..5f709d9 --- /dev/null +++ b/lib/compat/vsnprintf.c @@ -0,0 +1,81 @@ +/* + * libcompat - system compatibility library + * + * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk> + * Copyright © 2008-2012 Guillem Jover <guillem@debian.org> + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +#include <config.h> + +#include <sys/types.h> + +#include <unistd.h> +#include <stdarg.h> +#include <stdio.h> + +#include "compat.h" + +int +vsnprintf(char *buf, size_t maxsize, const char *fmt, va_list args) +{ + static FILE *file = NULL; + static pid_t file_pid; + + size_t want, nr; + int total; + + if (maxsize != 0 && buf == NULL) + return -1; + + /* Avoid race conditions from children after a fork(2). */ + if (file_pid > 0 && file_pid != getpid()) { + fclose(file); + file = NULL; + } + + if (!file) { + file = tmpfile(); + if (!file) + return -1; + file_pid = getpid(); + } else { + if (fseek(file, 0, 0)) + return -1; + if (ftruncate(fileno(file), 0)) + return -1; + } + + total = vfprintf(file, fmt, args); + if (total < 0) + return -1; + if (maxsize == 0) + return total; + if (total >= (int)maxsize) + want = maxsize - 1; + else + want = total; + if (fflush(file)) + return -1; + if (fseek(file, 0, SEEK_SET)) + return -1; + + nr = fread(buf, 1, want, file); + if (nr != want) + return -1; + buf[want] = '\0'; + + return total; +} |