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Add bootinfo_getarg(), which gets the name kernel command line argument 

and returns its value (sort of like getenv()).
This commit is contained in:
thorpej 2024-01-08 05:09:41 +00:00
parent cc3c7d5b6a
commit c5c43d8ecb
2 changed files with 50 additions and 3 deletions
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3
sys/arch/virt68k/include/bootinfo.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: bootinfo.h,v 1.4 2024/01/06 17:32:40 thorpej Exp $ */
/* $NetBSD: bootinfo.h,v 1.5 2024/01/08 05:09:41 thorpej Exp $ */
/*-
* Copyright (c) 2023 The NetBSD Foundation, Inc.
@ -156,6 +156,7 @@ bool bootinfo_addr_is_console(paddr_t);
void bootinfo_setup_initrd(void);
void bootinfo_setup_rndseed(void);
bool bootinfo_getarg(const char *, char *, size_t);
void bootinfo_md_cnattach(void (*)(bus_space_tag_t,
bus_space_handle_t),

50
sys/arch/virt68k/virt68k/bootinfo.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: bootinfo.c,v 1.5 2024/01/06 21:40:41 thorpej Exp $ */
/* $NetBSD: bootinfo.c,v 1.6 2024/01/08 05:09:41 thorpej Exp $ */
/*-
* Copyright (c) 2023 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bootinfo.c,v 1.5 2024/01/06 21:40:41 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: bootinfo.c,v 1.6 2024/01/08 05:09:41 thorpej Exp $");
#include "opt_md.h"
@ -426,3 +426,49 @@ bootinfo_setup_rndseed(void)
explicit_memset(rnd->data_bytes, 0, rnd->data_length);
}
}
/*
* bootinfo_getarg --
* Get an argument from the BI_COMMAND_LINE bootinfo record.
*/
bool
bootinfo_getarg(const char *var, char *buf, size_t buflen)
{
const size_t varlen = strlen(var);
struct bi_record *bi = bootinfo_find(BI_COMMAND_LINE);
if (bi == NULL) {
return false;
}
const char *sp = bootinfo_dataptr(bi);
const char *osp = sp;
for (;;) {
sp = strstr(sp, var);
if (sp == NULL) {
return false;
}
if (sp != osp &&
sp[-1] != ' ' && sp[-1] != '\t' && sp[-1] != '-') {
continue;
}
sp += varlen;
char ch = *sp++;
if (ch != '=' && ch != ' ' && ch != '\t' && ch != '\0') {
continue;
}
/* Found it. */
break;
}
while (--buflen) {
if (*sp == ' ' || *sp == '\t' || *sp == '\0') {
break;
}
*buf++ = *sp++;
}
*buf = '\0';
return true;
}