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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
commit | 5e61585d76ae77fd5e9e96ebabb57afa4d74880d (patch) | |
tree | 2b467823aaeebc7ef8bc9e3cabe8074eaef1666d /src/util/dir_forest.c | |
parent | Initial commit. (diff) | |
download | postfix-upstream/3.5.24.tar.xz postfix-upstream/3.5.24.zip |
Adding upstream version 3.5.24.upstream/3.5.24upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/util/dir_forest.c')
-rw-r--r-- | src/util/dir_forest.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/util/dir_forest.c b/src/util/dir_forest.c new file mode 100644 index 0000000..0070177 --- /dev/null +++ b/src/util/dir_forest.c @@ -0,0 +1,110 @@ +/*++ +/* NAME +/* dir_forest 3 +/* SUMMARY +/* file name to directory forest +/* SYNOPSIS +/* #include <dir_forest.h> +/* +/* char *dir_forest(buf, path, depth) +/* VSTRING *buf; +/* const char *path; +/* int depth; +/* DESCRIPTION +/* This module implements support for directory forests: a file +/* organization that introduces one or more levels of intermediate +/* subdirectories in order to reduce the number of files per directory. +/* +/* dir_forest() maps a file basename to a directory forest and +/* returns the resulting string: file name "abcd" becomes "a/b/" +/* and so on. The number of subdirectory levels is adjustable. +/* +/* Arguments: +/* .IP buf +/* A buffer that is overwritten with the result. The result +/* ends in "/" and is null terminated. If a null pointer is +/* specified, the result is written to a private buffer that +/* is overwritten upon each call. +/* .IP path +/* A null-terminated string of printable characters. Characters +/* special to the file system are not permitted. +/* The first subdirectory is named after the first character +/* in \fIpath\fR, and so on. When the path is shorter than the +/* desired number of subdirectory levels, directory names +/* of '_' (underscore) are used as replacement. +/* .IP depth +/* The desired number of subdirectory levels. +/* DIAGNOSTICS +/* Panic: interface violations. Fatal error: out of memory. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <ctype.h> + +/* Utility library. */ + +#include "msg.h" +#include "dir_forest.h" + +/* dir_forest - translate base name to directory forest */ + +char *dir_forest(VSTRING *buf, const char *path, int depth) +{ + const char *myname = "dir_forest"; + static VSTRING *private_buf = 0; + int n; + const char *cp; + int ch; + + /* + * Sanity checks. + */ + if (*path == 0) + msg_panic("%s: empty path", myname); + if (depth < 1) + msg_panic("%s: depth %d", myname, depth); + + /* + * Your buffer or mine? + */ + if (buf == 0) { + if (private_buf == 0) + private_buf = vstring_alloc(1); + buf = private_buf; + } + + /* + * Generate one or more subdirectory levels, depending on the pathname + * contents. When the pathname is short, use underscores instead. + * Disallow non-printable characters or characters that are special to + * the file system. + */ + VSTRING_RESET(buf); + for (cp = path, n = 0; n < depth; n++) { + if ((ch = *cp) == 0) { + ch = '_'; + } else { + if (!ISPRINT(ch) || ch == '.' || ch == '/') + msg_panic("%s: invalid pathname: %s", myname, path); + cp++; + } + VSTRING_ADDCH(buf, ch); + VSTRING_ADDCH(buf, '/'); + } + VSTRING_TERMINATE(buf); + + if (msg_verbose > 1) + msg_info("%s: %s -> %s", myname, path, vstring_str(buf)); + return (vstring_str(buf)); +} |