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| author | Denis Vlasenko <vda.linux@googlemail.com> | 2007-05-08 17:27:17 +0000 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2007-05-08 17:27:17 +0000 |
| commit | 92c0b8222eb50dd35c06e2f1265706b388762234 (patch) | |
| tree | c94def6f5c4cfbbcc1a7a70d96e721eb433ed01f /coreutils/tail.c | |
| parent | 0cacc80952a7a34f9cb8b384d6dd0b1522c37bae (diff) | |
| download | busybox-92c0b8222eb50dd35c06e2f1265706b388762234.tar.gz | |
tail: fix SEGV on "tail -N"
config system: clarify PREFER_APPLETS/SH_STANDALONE effects in help text
Diffstat (limited to 'coreutils/tail.c')
| -rw-r--r-- | coreutils/tail.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/coreutils/tail.c b/coreutils/tail.c index 629ee2125..32df25914 100644 --- a/coreutils/tail.c +++ b/coreutils/tail.c @@ -79,7 +79,8 @@ int tail_main(int argc, char **argv) unsigned sleep_period = 1; bool from_top; int header_threshhold = 1; - const char *str_c, *str_n, *str_s; + const char *str_c, *str_n; + USE_FEATURE_FANCY_TAIL(const char *str_s;) char *tailbuf; size_t tailbufsize; @@ -96,13 +97,18 @@ int tail_main(int argc, char **argv) if (argc >= 2 && (argv[1][0] == '+' || argv[1][0] == '-') && isdigit(argv[1][1]) ) { - argv[0] = (char*)"-n"; - argv--; - argc++; + /* replacing arg[0] with "-n" can segfault, so... */ + argv[1] = xasprintf("-n%s", argv[1]); +#if 0 /* If we ever decide to make tail NOFORK */ + char *s = alloca(strlen(argv[1]) + 3); + sprintf(s, "-n%s", argv[1]); + argv[1] = s; +#endif } #endif - opt = getopt32(argc, argv, "fc:n:" USE_FEATURE_FANCY_TAIL("qs:v"), &str_c, &str_n, &str_s); + opt = getopt32(argc, argv, "fc:n:" USE_FEATURE_FANCY_TAIL("qs:v"), + &str_c, &str_n USE_FEATURE_FANCY_TAIL(,&str_s)); #define FOLLOW (opt & 0x1) #define COUNT_BYTES (opt & 0x2) //if (opt & 0x1) // -f |