improve error handling in mntent stuff...

not sure if this is correct/ideal. it needs further attention.

diff --git a/src/linux/mntent.c b/src/linux/mntent.c
index 48c85bd627db62c5307220da97911c03730c2107..f151625285c36e6e92dcd2667c18beb3430a6478 100644 (file)
--- a/src/linux/mntent.c
+++ b/src/linux/mntent.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <mntent.h>
+#include <errno.h>
 
 FILE *setmntent(const char *name, const char *mode)
 {
@@ -22,7 +23,13 @@ struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int bufle
 
        do {
                fgets(linebuf, buflen, f);
-               if (feof(f)) return NULL;
+               if (feof(f) || ferror(f)) return 0;
+               if (!strchr(linebuf, '\n')) {
+                       if (fseeko(f, -(off_t)strlen(linebuf), SEEK_CUR))
+                               fscanf(f, "%*[^\n]%*[\n]");
+                       errno = ERANGE;
+                       return 0;
+               }
                cnt = sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
                        n, n+1, n+2, n+3, n+4, n+5, n+6, n+7,
                        &mnt->mnt_freq, &mnt->mnt_passno);
@@ -50,7 +57,7 @@ struct mntent *getmntent(FILE *f)
 
 int addmntent(FILE *f, const struct mntent *mnt)
 {
-       fseek(f, 0, SEEK_END);
+       if (fseek(f, 0, SEEK_END)) return 1;
        return fprintf(f, "%s\t%s\t%s\t%s\t%d\t%d\n",
                mnt->mnt_fsname, mnt->mnt_dir, mnt->mnt_type, mnt->mnt_opts,
                mnt->mnt_freq, mnt->mnt_passno) < 0;