diff options
Diffstat (limited to 'sysdeps/posix/tempname.c')
| -rw-r--r-- | sysdeps/posix/tempname.c | 58 |
1 files changed, 39 insertions, 19 deletions
diff --git a/sysdeps/posix/tempname.c b/sysdeps/posix/tempname.c index 6fd698e..d58024f 100644 --- a/sysdeps/posix/tempname.c +++ b/sysdeps/posix/tempname.c @@ -81,21 +81,24 @@ static const char letters[] = existing file will be returned. When the cycle reaches its end (12345ZZZ), NULL is returned. */ char * -__stdio_gen_tempname (const char *dir, const char *pfx, int dir_search, - size_t *lenptr, FILE **streamptr) +__stdio_gen_tempname (char *buf, size_t bufsize, const char *dir, + const char *pfx, int dir_search, size_t *lenptr, + FILE **streamptr) { int saverrno = errno; static const char tmpdir[] = P_tmpdir; static size_t indices[2]; size_t *idx; - static char buf[FILENAME_MAX]; +#if 0 static pid_t oldpid = (pid_t) 0; +#endif pid_t pid = __getpid(); register size_t len, plen, dlen; + int wrapped; if (dir_search) { - register const char *d = getenv ("TMPDIR"); + register const char *d = __secure_getenv ("TMPDIR"); if (d != NULL && !diraccess (d)) d = NULL; if (d == NULL && dir != NULL && diraccess (dir)) @@ -133,34 +136,51 @@ __stdio_gen_tempname (const char *dir, const char *pfx, int dir_search, dir = tmpdir; idx = &indices[(plen == 0 && dir == tmpdir) ? 1 : 0]; +#if 0 + /* XXX Is this ever useful??? At least when using a thread package + which uses different PIDs for the threads it is not helpful. */ if (pid != oldpid) { oldpid = pid; indices[0] = indices[1] = 0; } +#endif + wrapped = 0; /* We have not yet wrapped around the index counter. */ len = dlen + 1 + plen + 5 + 3; - while (*idx < ((sizeof (letters) - 1) * (sizeof (letters) - 1) * - (sizeof (letters) - 1))) + while (1) { - const size_t i = (*idx)++; + const size_t i; + + if (*idx >= ((sizeof (letters) - 1) * (sizeof (letters) - 1) * + (sizeof (letters) - 1))) + { + if (wrapped) + /* We really wrapped around this call. Can't believe it + but nevertheless stop the endless loop. */ + break; + + indices[0] = indices[1] = 0; + wrapped = 1; + } + + i = (*idx)++; /* Construct a file name and see if it already exists. We use a single counter in *IDX to cycle each of three character positions through each of 62 possible letters. */ - if (sizeof (buf) < len || - sprintf (buf, "%.*s/%.*s%.5d%c%c%c", - (int) dlen, dir, (int) plen, - pfx, pid % 100000, - letters[i % (sizeof (letters) - 1)], - letters[(i / (sizeof (letters) - 1)) - % (sizeof (letters) - 1)], - letters[(i / ((sizeof (letters) - 1) * - (sizeof (letters) - 1))) - % (sizeof (letters) - 1)] - ) != (int) len) + if (__snprintf (buf, bufsize, "%.*s/%.*s%.5d%c%c%c", + (int) dlen, dir, (int) plen, + pfx, pid % 100000, + letters[i % (sizeof (letters) - 1)], + letters[(i / (sizeof (letters) - 1)) + % (sizeof (letters) - 1)], + letters[(i / ((sizeof (letters) - 1) * + (sizeof (letters) - 1))) + % (sizeof (letters) - 1)] + ) != (int) len) return NULL; if (streamptr != NULL) @@ -176,7 +196,7 @@ __stdio_gen_tempname (const char *dir, const char *pfx, int dir_search, struct _IO_FILE_plus *fp; fp = (struct _IO_FILE_plus *) - malloc(sizeof (struct _IO_FILE_plus)); + malloc (sizeof (struct _IO_FILE_plus)); if (fp == NULL) { /* We lost trying to create a stream (out of memory?). |