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rewrite maketemp() obsoleting tempnam(3) and mkstemp(3) external deps

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tg
2012-04-14 16:07:48 +00:00
parent 70e6988d25
commit 5eea59ad57
7 changed files with 86 additions and 73 deletions
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85
main.c
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@@ -34,7 +34,7 @@
#include <locale.h>
#endif
__RCSID("$MirOS: src/bin/mksh/main.c,v 1.215 2012/04/06 12:59:26 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/main.c,v 1.216 2012/04/14 16:07:47 tg Exp $");
extern char **environ;
@@ -1015,7 +1015,7 @@ remove_temps(struct temp *tp)
{
for (; tp != NULL; tp = tp->next)
if (tp->pid == procpid)
unlink(tp->name);
unlink(tp->tffn);
}
/*
@@ -1499,42 +1499,61 @@ coproc_cleanup(int reuse)
struct temp *
maketemp(Area *ap, Temp_type type, struct temp **tlist)
{
struct temp *tp;
char *cp;
size_t len;
int fd;
char *pathname;
int i;
struct temp *tp;
const char *dir;
struct stat sb;
dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR;
#if HAVE_MKSTEMP
len = strlen(dir) + 6 + 10 + 1;
#else
pathname = tempnam(dir, "mksh.");
len = ((pathname == NULL) ? 0 : strlen(pathname)) + 1;
#endif
/* reasonably sure that this will not overflow */
tp = alloc(sizeof(struct temp) + len, ap);
tp->name = (char *)&tp[1];
#if !HAVE_MKSTEMP
if (pathname == NULL)
tp->name[0] = '\0';
else {
memcpy(tp->name, pathname, len);
free_ostempnam(pathname);
}
#endif
pathname = tp->name;
tp->shf = NULL;
tp->type = type;
#if HAVE_MKSTEMP
shf_snprintf(pathname, len, "%s%s", dir, "/mksh.XXXXXXXXXX");
if ((fd = mkstemp(pathname)) >= 0)
#else
if (tp->name[0] && (fd = open(tp->name, O_CREAT | O_RDWR, 0600)) >= 0)
#endif
tp->shf = shf_fdopen(fd, SHF_WR, NULL);
tp->pid = procpid;
/* add "/shXXXXXX.tmp" plus NUL */
len = strlen(dir);
checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14);
tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap);
tp->shf = NULL;
tp->pid = procpid;
tp->type = type;
if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) {
tp->tffn[0] = '\0';
goto maketemp_out;
}
cp = (void *)tp;
cp += offsetof(struct temp, tffn[0]);
memcpy(cp, dir, len);
cp += len;
memcpy(cp, "/shXXXXXX.tmp", 14);
/* point to the first of six Xes */
cp += 3;
/* generate random part of filename */
len = -1;
do {
i = rndget() % 36;
cp[++len] = i < 26 ? 'a' + i : '0' + i - 26;
} while (len < 5);
/* cyclically attempt to open a temporary file */
while ((i = open(tp->tffn, O_CREAT | O_EXCL | O_RDWR, 0600)) == -1) {
if (errno != EEXIST)
goto maketemp_out;
/* count down from z to a then from 9 to 0 */
while (cp[len] == '0')
if (!len--)
goto maketemp_out;
if (cp[len] == 'a')
cp[len] = '9';
else
--cp[len];
/* do another cycle */
}
/* shf_fdopen cannot fail, so no fd leak */
tp->shf = shf_fdopen(i, SHF_WR, NULL);
maketemp_out:
tp->next = *tlist;
*tlist = tp;
return (tp);