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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
339 lines
7.3 KiB
C
339 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Add to readline cmdline-editing by
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* (C) Copyright 2005
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* JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com>
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*/
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#include <common.h>
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#include <bootretry.h>
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#include <cli.h>
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#include <console.h>
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#include <linux/ctype.h>
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#define DEBUG_PARSER 0 /* set to 1 to debug */
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#define debug_parser(fmt, args...) \
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debug_cond(DEBUG_PARSER, fmt, ##args)
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int cli_simple_parse_line(char *line, char *argv[])
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{
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int nargs = 0;
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debug_parser("%s: \"%s\"\n", __func__, line);
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while (nargs < CONFIG_SYS_MAXARGS) {
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/* skip any white space */
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while (isblank(*line))
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++line;
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if (*line == '\0') { /* end of line, no more args */
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argv[nargs] = NULL;
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debug_parser("%s: nargs=%d\n", __func__, nargs);
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return nargs;
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}
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argv[nargs++] = line; /* begin of argument string */
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/* find end of string */
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while (*line && !isblank(*line))
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++line;
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if (*line == '\0') { /* end of line, no more args */
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argv[nargs] = NULL;
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debug_parser("parse_line: nargs=%d\n", nargs);
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return nargs;
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}
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*line++ = '\0'; /* terminate current arg */
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}
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printf("** Too many args (max. %d) **\n", CONFIG_SYS_MAXARGS);
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debug_parser("%s: nargs=%d\n", __func__, nargs);
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return nargs;
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}
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void cli_simple_process_macros(const char *input, char *output)
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{
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char c, prev;
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const char *varname_start = NULL;
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int inputcnt = strlen(input);
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int outputcnt = CONFIG_SYS_CBSIZE;
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int state = 0; /* 0 = waiting for '$' */
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/* 1 = waiting for '(' or '{' */
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/* 2 = waiting for ')' or '}' */
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/* 3 = waiting for ''' */
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char __maybe_unused *output_start = output;
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debug_parser("[PROCESS_MACROS] INPUT len %zd: \"%s\"\n", strlen(input),
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input);
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prev = '\0'; /* previous character */
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while (inputcnt && outputcnt) {
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c = *input++;
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inputcnt--;
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if (state != 3) {
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/* remove one level of escape characters */
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if ((c == '\\') && (prev != '\\')) {
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if (inputcnt-- == 0)
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break;
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prev = c;
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c = *input++;
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}
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}
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switch (state) {
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case 0: /* Waiting for (unescaped) $ */
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if ((c == '\'') && (prev != '\\')) {
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state = 3;
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break;
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}
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if ((c == '$') && (prev != '\\')) {
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state++;
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} else {
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*(output++) = c;
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outputcnt--;
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}
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break;
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case 1: /* Waiting for ( */
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if (c == '(' || c == '{') {
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state++;
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varname_start = input;
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} else {
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state = 0;
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*(output++) = '$';
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outputcnt--;
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if (outputcnt) {
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*(output++) = c;
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outputcnt--;
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}
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}
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break;
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case 2: /* Waiting for ) */
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if (c == ')' || c == '}') {
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int i;
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char envname[CONFIG_SYS_CBSIZE], *envval;
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/* Varname # of chars */
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int envcnt = input - varname_start - 1;
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/* Get the varname */
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for (i = 0; i < envcnt; i++)
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envname[i] = varname_start[i];
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envname[i] = 0;
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/* Get its value */
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envval = env_get(envname);
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/* Copy into the line if it exists */
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if (envval != NULL)
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while ((*envval) && outputcnt) {
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*(output++) = *(envval++);
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outputcnt--;
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}
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/* Look for another '$' */
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state = 0;
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}
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break;
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case 3: /* Waiting for ' */
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if ((c == '\'') && (prev != '\\')) {
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state = 0;
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} else {
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*(output++) = c;
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outputcnt--;
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}
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break;
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}
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prev = c;
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}
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if (outputcnt)
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*output = 0;
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else
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*(output - 1) = 0;
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debug_parser("[PROCESS_MACROS] OUTPUT len %zd: \"%s\"\n",
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strlen(output_start), output_start);
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}
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/*
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* WARNING:
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*
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* We must create a temporary copy of the command since the command we get
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* may be the result from env_get(), which returns a pointer directly to
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* the environment data, which may change magicly when the command we run
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* creates or modifies environment variables (like "bootp" does).
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*/
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int cli_simple_run_command(const char *cmd, int flag)
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{
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char cmdbuf[CONFIG_SYS_CBSIZE]; /* working copy of cmd */
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char *token; /* start of token in cmdbuf */
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char *sep; /* end of token (separator) in cmdbuf */
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char finaltoken[CONFIG_SYS_CBSIZE];
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char *str = cmdbuf;
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char *argv[CONFIG_SYS_MAXARGS + 1]; /* NULL terminated */
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int argc, inquotes;
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int repeatable = 1;
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int rc = 0;
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debug_parser("[RUN_COMMAND] cmd[%p]=\"", cmd);
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if (DEBUG_PARSER) {
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/* use puts - string may be loooong */
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puts(cmd ? cmd : "NULL");
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puts("\"\n");
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}
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clear_ctrlc(); /* forget any previous Control C */
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if (!cmd || !*cmd)
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return -1; /* empty command */
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if (strlen(cmd) >= CONFIG_SYS_CBSIZE) {
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puts("## Command too long!\n");
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return -1;
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}
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strcpy(cmdbuf, cmd);
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/* Process separators and check for invalid
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* repeatable commands
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*/
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debug_parser("[PROCESS_SEPARATORS] %s\n", cmd);
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while (*str) {
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/*
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* Find separator, or string end
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* Allow simple escape of ';' by writing "\;"
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*/
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for (inquotes = 0, sep = str; *sep; sep++) {
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if ((*sep == '\'') &&
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(*(sep - 1) != '\\'))
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inquotes = !inquotes;
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if (!inquotes &&
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(*sep == ';') && /* separator */
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(sep != str) && /* past string start */
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(*(sep - 1) != '\\')) /* and NOT escaped */
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break;
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}
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/*
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* Limit the token to data between separators
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*/
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token = str;
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if (*sep) {
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str = sep + 1; /* start of command for next pass */
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*sep = '\0';
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} else {
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str = sep; /* no more commands for next pass */
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}
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debug_parser("token: \"%s\"\n", token);
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/* find macros in this token and replace them */
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cli_simple_process_macros(token, finaltoken);
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/* Extract arguments */
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argc = cli_simple_parse_line(finaltoken, argv);
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if (argc == 0) {
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rc = -1; /* no command at all */
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continue;
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}
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if (cmd_process(flag, argc, argv, &repeatable, NULL))
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rc = -1;
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/* Did the user stop this? */
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if (had_ctrlc())
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return -1; /* if stopped then not repeatable */
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}
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return rc ? rc : repeatable;
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}
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void cli_simple_loop(void)
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{
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static char lastcommand[CONFIG_SYS_CBSIZE + 1] = { 0, };
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int len;
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int flag;
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int rc = 1;
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for (;;) {
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if (rc >= 0) {
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/* Saw enough of a valid command to
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* restart the timeout.
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*/
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bootretry_reset_cmd_timeout();
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}
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len = cli_readline(CONFIG_SYS_PROMPT);
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flag = 0; /* assume no special flags for now */
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if (len > 0)
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strlcpy(lastcommand, console_buffer,
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CONFIG_SYS_CBSIZE + 1);
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else if (len == 0)
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flag |= CMD_FLAG_REPEAT;
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#ifdef CONFIG_BOOT_RETRY_TIME
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else if (len == -2) {
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/* -2 means timed out, retry autoboot
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*/
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puts("\nTimed out waiting for command\n");
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# ifdef CONFIG_RESET_TO_RETRY
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/* Reinit board to run initialization code again */
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do_reset(NULL, 0, 0, NULL);
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# else
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return; /* retry autoboot */
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# endif
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}
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#endif
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if (len == -1)
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puts("<INTERRUPT>\n");
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else
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rc = run_command_repeatable(lastcommand, flag);
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if (rc <= 0) {
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/* invalid command or not repeatable, forget it */
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lastcommand[0] = 0;
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}
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}
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}
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int cli_simple_run_command_list(char *cmd, int flag)
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{
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char *line, *next;
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int rcode = 0;
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/*
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* Break into individual lines, and execute each line; terminate on
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* error.
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*/
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next = cmd;
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line = cmd;
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while (*next) {
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if (*next == '\n') {
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*next = '\0';
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/* run only non-empty commands */
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if (*line) {
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debug("** exec: \"%s\"\n", line);
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if (cli_simple_run_command(line, 0) < 0) {
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rcode = 1;
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break;
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}
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}
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line = next + 1;
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}
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++next;
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}
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if (rcode == 0 && *line)
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rcode = (cli_simple_run_command(line, 0) < 0);
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return rcode;
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}
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