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schorsch |
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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/*
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* Find a writeable tempfile directory.
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* Create unique filenames therein, and possibly open the file.
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*
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*/
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#include "copyright.h"
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#include "paths.h"
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#define TEMPFILE_TEMPLATE "rtXXXXXX"
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static const char *defaultpaths[] = DEFAULT_TEMPDIRS;
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/* Return a writeable directory for temporary files */
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/* If s is NULL, we return a static string */
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char *
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temp_directory(char *s, size_t len)
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{
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static char td[PATH_MAX] = "\0"; /* remember */
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char * ts = NULL;
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int i = 0;
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if (td[0] != '\0') { /* we already have one */
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if (s == NULL) { return td; }
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strncpy(s, td, len);
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s[len-1] = '\0';
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return s;
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}
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/* check where TMP and TEMP point to */
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ts = getenv("TMP");
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if (ts != NULL && access(ts, W_OK) == 0) {
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strncpy(td, ts, sizeof(td));
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td[sizeof(td)-1] = '\0';
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}
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if (ts == NULL) {
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ts = getenv("TEMP");
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if (ts != NULL && access(ts, W_OK) == 0) {
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strncpy(td, ts, sizeof(td));
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td[sizeof(td)-1] = '\0';
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}
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}
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/* check the platform specific default paths in order */
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while (ts == NULL) {
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if (defaultpaths[i] == NULL) {
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break;
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}
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if (access(defaultpaths[i], W_OK) == 0) {
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ts = strncpy(td, defaultpaths[i], sizeof(td));
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td[sizeof(td)-1] = '\0';
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break;
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}
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i++;
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}
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/* we found something */
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if (ts != NULL) {
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if (s == NULL) { return td; }
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strncpy(s, ts, len);
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s[len-1] = '\0';
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return s;
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}
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return NULL;
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}
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/* Concatenate two strings, leaving exactly one DIRSEP in between */
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char *
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append_filepath(char *s1, char *s2, size_t len)
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{
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size_t siz;
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char *s;
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siz = strlen(s1);
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/* XXX siz > len is an error */
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while (siz > 1 && ISDIRSEP(s1[siz-1])) {
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s1[siz-1] = '\0';
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siz--;
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}
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if (siz+1 <= len) {
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s1[siz] = DIRSEP;
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siz++;
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}
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while (ISDIRSEP(s2[0])) {
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s2++;
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}
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s = strncat(s1, s2, len-siz);
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return s;
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}
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/* Do the actual work for tempfiles, except for the uniquification */
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static char *
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prepare_tmpname(char *s, size_t len, char *templ)
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{
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static char lp[PATH_MAX] = "\0"; /* remember what we found last time */
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char *ts = NULL;
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if (s == NULL) { /* return our static string */
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s = lp;
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len = sizeof(lp);
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}
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ts = temp_directory(s, len);
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if (ts == NULL) { return NULL; }
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ts = append_filepath(ts, templ != NULL ? templ : TEMPFILE_TEMPLATE, len);
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return ts;
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}
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/* Compose a *currently* unique name within a temporary directory */
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/* If s is NULL, we return a static string */
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/* If templ is NULL, we take our default template */
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/* WARNING: On Windows, there's a maximum of 27 unique names within
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one process for the same template. */
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char *
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temp_filename(char *s, size_t len, char *templ)
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{
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char *ts = NULL;
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ts = prepare_tmpname(s, len, templ);
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if (ts == NULL) { return NULL; }
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return mktemp(ts);
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}
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/* Open a unique temp file in a safe way (not safe on Windows) */
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/* If s is NULL, we use a static string the caller won't learn about */
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/* If templ is NULL, we take our default template */
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/* This one is supposed to protect against race conditions on unix */
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/* WARNING: On Windows, there's no protection against race conditions */
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/* WARNING: On Windows, there's a maximum of 27 unique names within
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one process for the same template. */
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int
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temp_file(char *s, size_t len, char *templ)
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{
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char *ts = NULL;
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ts = prepare_tmpname(s, len, templ);
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if (ts == NULL) return -1;
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#ifdef _WIN32
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ts = mktemp(ts);
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if (ts == NULL) return -1;
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return fopen(ts, "r+b");
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#else
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return mkstemp(ts);
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#endif
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}
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#ifdef MODULE_TEST
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int main()
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{
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static char p[PATH_MAX] = "\0";
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char * pp, *qq = NULL;
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pp = temp_directory(p, sizeof(p));
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printf("%s\n", pp);
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qq = temp_filename(pp, sizeof(p), "//something/else_XXXXXX");
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printf("%s\n", qq);
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qq = temp_filename(pp, sizeof(p), NULL);
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printf("%s\n", qq);
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}
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#endif
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