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pxe_utils.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2010-2011 Calxeda, Inc.
* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <env.h>
#include <image.h>
#include <log.h>
#include <malloc.h>
#include <mapmem.h>
#include <lcd.h>
#include <net.h>
#include <fdt_support.h>
#include <video.h>
#include <linux/libfdt.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <errno.h>
#include <linux/list.h>
#ifdef CONFIG_DM_RNG
#include <rng.h>
#endif
#include <splash.h>
#include <asm/io.h>
#include "menu.h"
#include "cli.h"
#include "pxe_utils.h"
#define MAX_TFTP_PATH_LEN 512
int pxe_get_file_size(ulong *sizep)
{
const char *val;
val = from_env("filesize");
if (!val)
return -ENOENT;
if (strict_strtoul(val, 16, sizep) < 0)
return -EINVAL;
return 0;
}
/**
* format_mac_pxe() - obtain a MAC address in the PXE format
*
* This produces a MAC-address string in the format for the current ethernet
* device:
*
* 01-aa-bb-cc-dd-ee-ff
*
* where aa-ff is the MAC address in hex
*
* @outbuf: Buffer to write string to
* @outbuf_len: length of buffer
* Return: 1 if OK, -ENOSPC if buffer is too small, -ENOENT is there is no
* current ethernet device
*/
int format_mac_pxe(char *outbuf, size_t outbuf_len)
{
uchar ethaddr[6];
if (outbuf_len < 21) {
printf("outbuf is too small (%zd < 21)\n", outbuf_len);
return -ENOSPC;
}
if (!eth_env_get_enetaddr_by_index("eth", eth_get_dev_index(), ethaddr))
return -ENOENT;
sprintf(outbuf, "01-%02x-%02x-%02x-%02x-%02x-%02x",
ethaddr[0], ethaddr[1], ethaddr[2],
ethaddr[3], ethaddr[4], ethaddr[5]);
return 1;
}
/**
* get_relfile() - read a file relative to the PXE file
*
* As in pxelinux, paths to files referenced from files we retrieve are
* relative to the location of bootfile. get_relfile takes such a path and
* joins it with the bootfile path to get the full path to the target file. If
* the bootfile path is NULL, we use file_path as is.
*
* @ctx: PXE context
* @file_path: File path to read (relative to the PXE file)
* @file_addr: Address to load file to
* @filesizep: If not NULL, returns the file size in bytes
* Returns 1 for success, or < 0 on error
*/
static int get_relfile(struct pxe_context *ctx, const char *file_path,
unsigned long file_addr, ulong *filesizep)
{
size_t path_len;
char relfile[MAX_TFTP_PATH_LEN + 1];
char addr_buf[18];
ulong size;
int ret;
if (file_path[0] == '/' && ctx->allow_abs_path)
*relfile = '\0';
else
strncpy(relfile, ctx->bootdir, MAX_TFTP_PATH_LEN);
path_len = strlen(file_path) + strlen(relfile);
if (path_len > MAX_TFTP_PATH_LEN) {
printf("Base path too long (%s%s)\n", relfile, file_path);
return -ENAMETOOLONG;
}
strcat(relfile, file_path);
printf("Retrieving file: %s\n", relfile);
sprintf(addr_buf, "%lx", file_addr);
ret = ctx->getfile(ctx, relfile, addr_buf, &size);
if (ret < 0)
return log_msg_ret("get", ret);
if (filesizep)
*filesizep = size;
return 1;
}
/**
* get_pxe_file() - read a file
*
* The file is read and nul-terminated
*
* @ctx: PXE context
* @file_path: File path to read (relative to the PXE file)
* @file_addr: Address to load file to
* Returns 1 for success, or < 0 on error
*/
int get_pxe_file(struct pxe_context *ctx, const char *file_path,
ulong file_addr)
{
ulong size;
int err;
char *buf;
err = get_relfile(ctx, file_path, file_addr, &size);
if (err < 0)
return err;
buf = map_sysmem(file_addr + size, 1);
*buf = '\0';
unmap_sysmem(buf);
return 1;
}
#define PXELINUX_DIR "pxelinux.cfg/"
/**
* get_pxelinux_path() - Get a file in the pxelinux.cfg/ directory
*
* @ctx: PXE context
* @file: Filename to process (relative to pxelinux.cfg/)
* Returns 1 for success, -ENAMETOOLONG if the resulting path is too long.
* or other value < 0 on other error
*/
int get_pxelinux_path(struct pxe_context *ctx, const char *file,
unsigned long pxefile_addr_r)
{
size_t base_len = strlen(PXELINUX_DIR);
char path[MAX_TFTP_PATH_LEN + 1];
if (base_len + strlen(file) > MAX_TFTP_PATH_LEN) {
printf("path (%s%s) too long, skipping\n",
PXELINUX_DIR, file);
return -ENAMETOOLONG;
}
sprintf(path, PXELINUX_DIR "%s", file);
return get_pxe_file(ctx, path, pxefile_addr_r);
}
/**
* get_relfile_envaddr() - read a file to an address in an env var
*
* Wrapper to make it easier to store the file at file_path in the location
* specified by envaddr_name. file_path will be joined to the bootfile path,
* if any is specified.
*
* @ctx: PXE context
* @file_path: File path to read (relative to the PXE file)
* @envaddr_name: Name of environment variable which contains the address to
* load to
* @filesizep: Returns the file size in bytes
* Returns 1 on success, -ENOENT if @envaddr_name does not exist as an
* environment variable, -EINVAL if its format is not valid hex, or other
* value < 0 on other error
*/
static int get_relfile_envaddr(struct pxe_context *ctx, const char *file_path,
const char *envaddr_name, ulong *filesizep)
{
unsigned long file_addr;
char *envaddr;
envaddr = from_env(envaddr_name);
if (!envaddr)
return -ENOENT;
if (strict_strtoul(envaddr, 16, &file_addr) < 0)
return -EINVAL;
return get_relfile(ctx, file_path, file_addr, filesizep);
}
/**
* label_create() - crate a new PXE label
*
* Allocates memory for and initializes a pxe_label. This uses malloc, so the
* result must be free()'d to reclaim the memory.
*
* Returns a pointer to the label, or NULL if out of memory
*/
static struct pxe_label *label_create(void)
{
struct pxe_label *label;
label = malloc(sizeof(struct pxe_label));
if (!label)
return NULL;
memset(label, 0, sizeof(struct pxe_label));
return label;
}
/**
* label_destroy() - free the memory used by a pxe_label
*
* This frees @label itself as well as memory used by its name,
* kernel, config, append, initrd, fdt, fdtdir and fdtoverlay members, if
* they're non-NULL.
*
* So - be sure to only use dynamically allocated memory for the members of
* the pxe_label struct, unless you want to clean it up first. These are
* currently only created by the pxe file parsing code.
*
* @label: Label to free
*/
static void label_destroy(struct pxe_label *label)
{
free(label->name);
free(label->kernel);
free(label->config);
free(label->append);
free(label->initrd);
free(label->fdt);
free(label->fdtdir);
free(label->fdtoverlays);
free(label);
}
/**
* label_print() - Print a label and its string members if they're defined
*
* This is passed as a callback to the menu code for displaying each
* menu entry.
*
* @data: Label to print (is cast to struct pxe_label *)
*/
static void label_print(void *data)
{
struct pxe_label *label = data;
const char *c = label->menu ? label->menu : label->name;
printf("%s:\t%s\n", label->num, c);
}
/**
* label_localboot() - Boot a label that specified 'localboot'
*
* This requires that the 'localcmd' environment variable is defined. Its
* contents will be executed as U-Boot commands. If the label specified an
* 'append' line, its contents will be used to overwrite the contents of the
* 'bootargs' environment variable prior to running 'localcmd'.
*
* @label: Label to process
* Returns 1 on success or < 0 on error
*/
static int label_localboot(struct pxe_label *label)
{
char *localcmd;
localcmd = from_env("localcmd");
if (!localcmd)
return -ENOENT;
if (label->append) {
char bootargs[CONFIG_SYS_CBSIZE];
cli_simple_process_macros(label->append, bootargs,
sizeof(bootargs));
env_set("bootargs", bootargs);
}
debug("running: %s\n", localcmd);
return run_command_list(localcmd, strlen(localcmd), 0);
}
/*
* label_boot_kaslrseed generate kaslrseed from hw rng
*/
static void label_boot_kaslrseed(void)
{
#ifdef CONFIG_DM_RNG
ulong fdt_addr;
struct fdt_header *working_fdt;
size_t n = 0x8;
struct udevice *dev;
u64 *buf;
int nodeoffset;
int err;
/* Get the main fdt and map it */
fdt_addr = hextoul(env_get("fdt_addr_r"), NULL);
working_fdt = map_sysmem(fdt_addr, 0);
err = fdt_check_header(working_fdt);
if (err)
return;
/* add extra size for holding kaslr-seed */
/* err is new fdt size, 0 or negtive */
err = fdt_shrink_to_minimum(working_fdt, 512);
if (err <= 0)
return;
if (uclass_get_device(UCLASS_RNG, 0, &dev) || !dev) {
printf("No RNG device\n");
return;
}
nodeoffset = fdt_find_or_add_subnode(working_fdt, 0, "chosen");
if (nodeoffset < 0) {
printf("Reading chosen node failed\n");
return;
}
buf = malloc(n);
if (!buf) {
printf("Out of memory\n");
return;
}
if (dm_rng_read(dev, buf, n)) {
printf("Reading RNG failed\n");
goto err;
}
err = fdt_setprop(working_fdt, nodeoffset, "kaslr-seed", buf, sizeof(buf));
if (err < 0) {
printf("Unable to set kaslr-seed on chosen node: %s\n", fdt_strerror(err));
goto err;
}
err:
free(buf);
#endif
return;
}
/**
* label_boot_fdtoverlay() - Loads fdt overlays specified in 'fdtoverlays'
*
* @ctx: PXE context
* @label: Label to process
*/
#ifdef CONFIG_OF_LIBFDT_OVERLAY
static void label_boot_fdtoverlay(struct pxe_context *ctx,
struct pxe_label *label)
{
char *fdtoverlay = label->fdtoverlays;
struct fdt_header *working_fdt;
char *fdtoverlay_addr_env;
ulong fdtoverlay_addr;
ulong fdt_addr;
int err;
/* Get the main fdt and map it */
fdt_addr = hextoul(env_get("fdt_addr_r"), NULL);
working_fdt = map_sysmem(fdt_addr, 0);
err = fdt_check_header(working_fdt);
if (err)
return;
/* Get the specific overlay loading address */
fdtoverlay_addr_env = env_get("fdtoverlay_addr_r");
if (!fdtoverlay_addr_env) {
printf("Invalid fdtoverlay_addr_r for loading overlays\n");
return;
}
fdtoverlay_addr = hextoul(fdtoverlay_addr_env, NULL);
/* Cycle over the overlay files and apply them in order */
do {
struct fdt_header *blob;
char *overlayfile;
char *end;
int len;
/* Drop leading spaces */
while (*fdtoverlay == ' ')
++fdtoverlay;
/* Copy a single filename if multiple provided */
end = strstr(fdtoverlay, " ");
if (end) {
len = (int)(end - fdtoverlay);
overlayfile = malloc(len + 1);
strncpy(overlayfile, fdtoverlay, len);
overlayfile[len] = '\0';
} else
overlayfile = fdtoverlay;
if (!strlen(overlayfile))
goto skip_overlay;
/* Load overlay file */
err = get_relfile_envaddr(ctx, overlayfile, "fdtoverlay_addr_r",
NULL);
if (err < 0) {
printf("Failed loading overlay %s\n", overlayfile);
goto skip_overlay;
}
/* Resize main fdt */
fdt_shrink_to_minimum(working_fdt, 8192);
blob = map_sysmem(fdtoverlay_addr, 0);
err = fdt_check_header(blob);
if (err) {
printf("Invalid overlay %s, skipping\n",
overlayfile);
goto skip_overlay;
}
err = fdt_overlay_apply_verbose(working_fdt, blob);
if (err) {
printf("Failed to apply overlay %s, skipping\n",
overlayfile);
goto skip_overlay;
}
skip_overlay:
if (end)
free(overlayfile);
} while ((fdtoverlay = strstr(fdtoverlay, " ")));
}
#endif
/**
* label_boot() - Boot according to the contents of a pxe_label
*
* If we can't boot for any reason, we return. A successful boot never
* returns.
*
* The kernel will be stored in the location given by the 'kernel_addr_r'
* environment variable.
*
* If the label specifies an initrd file, it will be stored in the location
* given by the 'ramdisk_addr_r' environment variable.
*
* If the label specifies an 'append' line, its contents will overwrite that
* of the 'bootargs' environment variable.
*
* @ctx: PXE context
* @label: Label to process
* Returns does not return on success, otherwise returns 0 if a localboot
* label was processed, or 1 on error
*/
static int label_boot(struct pxe_context *ctx, struct pxe_label *label)
{
char *bootm_argv[] = { "bootm", NULL, NULL, NULL, NULL };
char *zboot_argv[] = { "zboot", NULL, "0", NULL, NULL };
char *kernel_addr = NULL;
char *initrd_addr_str = NULL;
char initrd_filesize[10];
char initrd_str[28];
char mac_str[29] = "";
char ip_str[68] = "";
char *fit_addr = NULL;
int bootm_argc = 2;
int zboot_argc = 3;
int len = 0;
ulong kernel_addr_r;
void *buf;
label_print(label);
label->attempted = 1;
if (label->localboot) {
if (label->localboot_val >= 0)
label_localboot(label);
return 0;
}
if (!label->kernel) {
printf("No kernel given, skipping %s\n",
label->name);
return 1;
}
if (label->initrd) {
ulong size;
if (get_relfile_envaddr(ctx, label->initrd, "ramdisk_addr_r",
&size) < 0) {
printf("Skipping %s for failure retrieving initrd\n",
label->name);
return 1;
}
initrd_addr_str = env_get("ramdisk_addr_r");
strcpy(initrd_filesize, simple_xtoa(size));
strncpy(initrd_str, initrd_addr_str, 18);
strcat(initrd_str, ":");
strncat(initrd_str, initrd_filesize, 9);
}
if (get_relfile_envaddr(ctx, label->kernel, "kernel_addr_r",
NULL) < 0) {
printf("Skipping %s for failure retrieving kernel\n",
label->name);
return 1;
}
if (label->ipappend & 0x1) {
sprintf(ip_str, " ip=%s:%s:%s:%s",
env_get("ipaddr"), env_get("serverip"),
env_get("gatewayip"), env_get("netmask"));
}
if (IS_ENABLED(CONFIG_CMD_NET)) {
if (label->ipappend & 0x2) {
int err;
strcpy(mac_str, " BOOTIF=");
err = format_mac_pxe(mac_str + 8, sizeof(mac_str) - 8);
if (err < 0)
mac_str[0] = '\0';
}
}
if ((label->ipappend & 0x3) || label->append) {
char bootargs[CONFIG_SYS_CBSIZE] = "";
char finalbootargs[CONFIG_SYS_CBSIZE];
if (strlen(label->append ?: "") +
strlen(ip_str) + strlen(mac_str) + 1 > sizeof(bootargs)) {
printf("bootarg overflow %zd+%zd+%zd+1 > %zd\n",
strlen(label->append ?: ""),
strlen(ip_str), strlen(mac_str),
sizeof(bootargs));
return 1;
}
if (label->append)
strncpy(bootargs, label->append, sizeof(bootargs));
strcat(bootargs, ip_str);
strcat(bootargs, mac_str);
cli_simple_process_macros(bootargs, finalbootargs,
sizeof(finalbootargs));
env_set("bootargs", finalbootargs);
printf("append: %s\n", finalbootargs);
}
kernel_addr = env_get("kernel_addr_r");
/* for FIT, append the configuration identifier */
if (label->config) {
int len = strlen(kernel_addr) + strlen(label->config) + 1;
fit_addr = malloc(len);
if (!fit_addr) {
printf("malloc fail (FIT address)\n");
return 1;
}
snprintf(fit_addr, len, "%s%s", kernel_addr, label->config);
kernel_addr = fit_addr;
}
/*
* fdt usage is optional:
* It handles the following scenarios.
*
* Scenario 1: If fdt_addr_r specified and "fdt" or "fdtdir" label is
* defined in pxe file, retrieve fdt blob from server. Pass fdt_addr_r to
* bootm, and adjust argc appropriately.
*
* If retrieve fails and no exact fdt blob is specified in pxe file with
* "fdt" label, try Scenario 2.
*
* Scenario 2: If there is an fdt_addr specified, pass it along to
* bootm, and adjust argc appropriately.
*
* Scenario 3: If there is an fdtcontroladdr specified, pass it along to
* bootm, and adjust argc appropriately.
*
* Scenario 4: fdt blob is not available.
*/
bootm_argv[3] = env_get("fdt_addr_r");
/* if fdt label is defined then get fdt from server */
if (bootm_argv[3]) {
char *fdtfile = NULL;
char *fdtfilefree = NULL;
if (label->fdt) {
fdtfile = label->fdt;
} else if (label->fdtdir) {
char *f1, *f2, *f3, *f4, *slash;
f1 = env_get("fdtfile");
if (f1) {
f2 = "";
f3 = "";
f4 = "";
} else {
/*
* For complex cases where this code doesn't
* generate the correct filename, the board
* code should set $fdtfile during early boot,
* or the boot scripts should set $fdtfile
* before invoking "pxe" or "sysboot".
*/
f1 = env_get("soc");
f2 = "-";
f3 = env_get("board");
f4 = ".dtb";
if (!f1) {
f1 = "";
f2 = "";
}
if (!f3) {
f2 = "";
f3 = "";
}
}
len = strlen(label->fdtdir);
if (!len)
slash = "./";
else if (label->fdtdir[len - 1] != '/')
slash = "/";
else
slash = "";
len = strlen(label->fdtdir) + strlen(slash) +
strlen(f1) + strlen(f2) + strlen(f3) +
strlen(f4) + 1;
fdtfilefree = malloc(len);
if (!fdtfilefree) {
printf("malloc fail (FDT filename)\n");
goto cleanup;
}
snprintf(fdtfilefree, len, "%s%s%s%s%s%s",
label->fdtdir, slash, f1, f2, f3, f4);
fdtfile = fdtfilefree;
}
if (fdtfile) {
int err = get_relfile_envaddr(ctx, fdtfile,
"fdt_addr_r", NULL);
free(fdtfilefree);
if (err < 0) {
bootm_argv[3] = NULL;
if (label->fdt) {
printf("Skipping %s for failure retrieving FDT\n",
label->name);
goto cleanup;
}
}
if (label->kaslrseed)
label_boot_kaslrseed();
#ifdef CONFIG_OF_LIBFDT_OVERLAY
if (label->fdtoverlays)
label_boot_fdtoverlay(ctx, label);
#endif
} else {
bootm_argv[3] = NULL;
}
}
bootm_argv[1] = kernel_addr;
zboot_argv[1] = kernel_addr;
if (initrd_addr_str) {
bootm_argv[2] = initrd_str;
bootm_argc = 3;
zboot_argv[3] = initrd_addr_str;
zboot_argv[4] = initrd_filesize;
zboot_argc = 5;
}
if (!bootm_argv[3])
bootm_argv[3] = env_get("fdt_addr");
if (!bootm_argv[3])
bootm_argv[3] = env_get("fdtcontroladdr");
if (bootm_argv[3]) {
if (!bootm_argv[2])
bootm_argv[2] = "-";
bootm_argc = 4;
}
kernel_addr_r = genimg_get_kernel_addr(kernel_addr);
buf = map_sysmem(kernel_addr_r, 0);
/* Try bootm for legacy and FIT format image */
if (genimg_get_format(buf) != IMAGE_FORMAT_INVALID)
do_bootm(ctx->cmdtp, 0, bootm_argc, bootm_argv);
/* Try booting an AArch64 Linux kernel image */
else if (IS_ENABLED(CONFIG_CMD_BOOTI))
do_booti(ctx->cmdtp, 0, bootm_argc, bootm_argv);
/* Try booting a Image */
else if (IS_ENABLED(CONFIG_CMD_BOOTZ))
do_bootz(ctx->cmdtp, 0, bootm_argc, bootm_argv);
/* Try booting an x86_64 Linux kernel image */
else if (IS_ENABLED(CONFIG_CMD_ZBOOT))
do_zboot_parent(ctx->cmdtp, 0, zboot_argc, zboot_argv, NULL);
unmap_sysmem(buf);
cleanup:
free(fit_addr);
return 1;
}
/** enum token_type - Tokens for the pxe file parser */
enum token_type {
T_EOL,
T_STRING,
T_EOF,
T_MENU,
T_TITLE,
T_TIMEOUT,
T_LABEL,
T_KERNEL,
T_LINUX,
T_APPEND,
T_INITRD,
T_LOCALBOOT,
T_DEFAULT,
T_PROMPT,
T_INCLUDE,
T_FDT,
T_FDTDIR,
T_FDTOVERLAYS,
T_ONTIMEOUT,
T_IPAPPEND,
T_BACKGROUND,
T_KASLRSEED,
T_INVALID
};
/** struct token - token - given by a value and a type */
struct token {
char *val;
enum token_type type;
};
/* Keywords recognized */
static const struct token keywords[] = {
{"menu", T_MENU},
{"title", T_TITLE},
{"timeout", T_TIMEOUT},
{"default", T_DEFAULT},
{"prompt", T_PROMPT},
{"label", T_LABEL},
{"kernel", T_KERNEL},
{"linux", T_LINUX},
{"localboot", T_LOCALBOOT},
{"append", T_APPEND},
{"initrd", T_INITRD},
{"include", T_INCLUDE},
{"devicetree", T_FDT},
{"fdt", T_FDT},
{"devicetreedir", T_FDTDIR},
{"fdtdir", T_FDTDIR},
{"fdtoverlays", T_FDTOVERLAYS},
{"ontimeout", T_ONTIMEOUT,},
{"ipappend", T_IPAPPEND,},
{"background", T_BACKGROUND,},
{"kaslrseed", T_KASLRSEED,},
{NULL, T_INVALID}
};
/**
* enum lex_state - lexer state
*
* Since pxe(linux) files don't have a token to identify the start of a
* literal, we have to keep track of when we're in a state where a literal is
* expected vs when we're in a state a keyword is expected.
*/
enum lex_state {
L_NORMAL = 0,
L_KEYWORD,
L_SLITERAL
};
/**
* get_string() - retrieves a string from *p and stores it as a token in *t.
*
* This is used for scanning both string literals and keywords.
*
* Characters from *p are copied into t-val until a character equal to
* delim is found, or a NUL byte is reached. If delim has the special value of
* ' ', any whitespace character will be used as a delimiter.
*
* If lower is unequal to 0, uppercase characters will be converted to
* lowercase in the result. This is useful to make keywords case
* insensitive.
*
* The location of *p is updated to point to the first character after the end
* of the token - the ending delimiter.
*
* Memory for t->val is allocated using malloc and must be free()'d to reclaim
* it.
*
* @p: Points to a pointer to the current position in the input being processed.
* Updated to point at the first character after the current token
* @t: Pointers to a token to fill in
* @delim: Delimiter character to look for, either newline or space
* @lower: true to convert the string to lower case when storing
* Returns the new value of t->val, on success, NULL if out of memory
*/
static char *get_string(char **p, struct token *t, char delim, int lower)
{
char *b, *e;
size_t len, i;
/*
* b and e both start at the beginning of the input stream.
*
* e is incremented until we find the ending delimiter, or a NUL byte
* is reached. Then, we take e - b to find the length of the token.
*/
b = *p;
e = *p;
while (*e) {
if ((delim == ' ' && isspace(*e)) || delim == *e)
break;
e++;
}
len = e - b;
/*
* Allocate memory to hold the string, and copy it in, converting
* characters to lowercase if lower is != 0.
*/
t->val = malloc(len + 1);
if (!t->val)
return NULL;
for (i = 0; i < len; i++, b++) {
if (lower)
t->val[i] = tolower(*b);
else
t->val[i] = *b;
}
t->val[len] = '\0';
/* Update *p so the caller knows where to continue scanning */
*p = e;
t->type = T_STRING;
return t->val;
}
/**
* get_keyword() - Populate a keyword token with a type and value
*
* Updates the ->type field based on the keyword string in @val
* @t: Token to populate
*/
static void get_keyword(struct token *t)
{
int i;
for (i = 0; keywords[i].val; i++) {
if (!strcmp(t->val, keywords[i].val)) {
t->type = keywords[i].type;
break;
}
}
}
/**
* get_token() - Get the next token
*
* We have to keep track of which state we're in to know if we're looking to get
* a string literal or a keyword.
*
* @p: Points to a pointer to the current position in the input being processed.
* Updated to point at the first character after the current token
*/
static void get_token(char **p, struct token *t, enum lex_state state)
{
char *c = *p;
t->type = T_INVALID;
/* eat non EOL whitespace */
while (isblank(*c))
c++;
/*
* eat comments. note that string literals can't begin with #, but
* can contain a # after their first character.
*/
if (*c == '#') {
while (*c && *c != '\n')
c++;
}
if (*c == '\n') {
t->type = T_EOL;
c++;
} else if (*c == '\0') {
t->type = T_EOF;
c++;
} else if (state == L_SLITERAL) {
get_string(&c, t, '\n', 0);
} else if (state == L_KEYWORD) {
/*
* when we expect a keyword, we first get the next string
* token delimited by whitespace, and then check if it
* matches a keyword in our keyword list. if it does, it's
* converted to a keyword token of the appropriate type, and
* if not, it remains a string token.
*/
get_string(&c, t, ' ', 1);
get_keyword(t);
}
*p = c;
}
/**
* eol_or_eof() - Find end of line
*
* Increment *c until we get to the end of the current line, or EOF
*
* @c: Points to a pointer to the current position in the input being processed.
* Updated to point at the first character after the current token
*/
static void eol_or_eof(char **c)
{
while (**c && **c != '\n')
(*c)++;
}
/*
* All of these parse_* functions share some common behavior.
*
* They finish with *c pointing after the token they parse, and return 1 on
* success, or < 0 on error.
*/
/*
* Parse a string literal and store a pointer it at *dst. String literals
* terminate at the end of the line.
*/
static int parse_sliteral(char **c, char **dst)
{
struct token t;
char *s = *c;