Date: Thu, 17 May 2018 23:07:51 +0000 (UTC) From: Brooks Davis <brooks@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r333773 - head/sys/kern Message-ID: <201805172307.w4HN7pw8028517@repo.freebsd.org>
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Author: brooks Date: Thu May 17 23:07:51 2018 New Revision: 333773 URL: https://svnweb.freebsd.org/changeset/base/333773 Log: Use strsep() to parse init_path in start_init(). This simplifies the use of the path variable by making it NUL terminated. This is a prerequisite for further cleanups. Reviewed by: imp Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D15467 Modified: head/sys/kern/init_main.c Modified: head/sys/kern/init_main.c ============================================================================== --- head/sys/kern/init_main.c Thu May 17 22:40:22 2018 (r333772) +++ head/sys/kern/init_main.c Thu May 17 23:07:51 2018 (r333773) @@ -698,7 +698,9 @@ start_init(void *dummy) vm_offset_t addr; struct execve_args args; int options, error; - char *var, *path, *next, *s; + size_t pathlen; + char *var, *path; + char *free_init_path, *tmp_init_path; char *ucp, **uap, *arg0, *arg1; struct thread *td; struct proc *p; @@ -727,17 +729,12 @@ start_init(void *dummy) strlcpy(init_path, var, sizeof(init_path)); freeenv(var); } + free_init_path = tmp_init_path = strdup(init_path, M_TEMP); - for (path = init_path; *path != '\0'; path = next) { - while (*path == ':') - path++; - if (*path == '\0') - break; - for (next = path; *next != '\0' && *next != ':'; next++) - /* nothing */ ; + while ((path = strsep(&tmp_init_path, ":")) != NULL) { + pathlen = strlen(path) + 1; if (bootverbose) - printf("start_init: trying %.*s\n", (int)(next - path), - path); + printf("start_init: trying %s\n", path); /* * Move out the boot flag argument. @@ -769,9 +766,8 @@ start_init(void *dummy) /* * Move out the file name (also arg 0). */ - (void)subyte(--ucp, 0); - for (s = next - 1; s >= path; s--) - (void)subyte(--ucp, *s); + ucp -= pathlen; + copyout(path, ucp, pathlen); arg0 = ucp; /* @@ -797,13 +793,14 @@ start_init(void *dummy) * to user mode as init! */ if ((error = sys_execve(td, &args)) == EJUSTRETURN) { + free(free_init_path, M_TEMP); TSEXIT(); return; } if (error != ENOENT) - printf("exec %.*s: error %d\n", (int)(next - path), - path, error); + printf("exec %s: error %d\n", path, error); } + free(free_init_path, M_TEMP); printf("init: not found in path %s\n", init_path); panic("no init"); }
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