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common/cli_simple.c
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * (C) Copyright 2000 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * Add to readline cmdline-editing by * (C) Copyright 2005 * JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com> |
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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 <env.h> |
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#include <linux/ctype.h> #define DEBUG_PARSER 0 /* set to 1 to debug */ #define debug_parser(fmt, args...) \ debug_cond(DEBUG_PARSER, fmt, ##args) |
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int cli_simple_parse_line(char *line, char *argv[]) |
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{ int nargs = 0; debug_parser("%s: \"%s\" ", __func__, line); while (nargs < CONFIG_SYS_MAXARGS) { /* skip any white space */ while (isblank(*line)) ++line; if (*line == '\0') { /* end of line, no more args */ argv[nargs] = NULL; debug_parser("%s: nargs=%d ", __func__, nargs); return nargs; } argv[nargs++] = line; /* begin of argument string */ /* find end of string */ while (*line && !isblank(*line)) ++line; if (*line == '\0') { /* end of line, no more args */ argv[nargs] = NULL; debug_parser("parse_line: nargs=%d ", nargs); return nargs; } *line++ = '\0'; /* terminate current arg */ } printf("** Too many args (max. %d) ** ", CONFIG_SYS_MAXARGS); debug_parser("%s: nargs=%d ", __func__, nargs); return nargs; } |
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void cli_simple_process_macros(const char *input, char *output) |
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{ char c, prev; const char *varname_start = NULL; int inputcnt = strlen(input); int outputcnt = CONFIG_SYS_CBSIZE; int state = 0; /* 0 = waiting for '$' */ /* 1 = waiting for '(' or '{' */ /* 2 = waiting for ')' or '}' */ /* 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\" ", strlen(input), input); prev = '\0'; /* previous character */ while (inputcnt && outputcnt) { c = *input++; inputcnt--; if (state != 3) { /* remove one level of escape characters */ if ((c == '\\') && (prev != '\\')) { if (inputcnt-- == 0) break; prev = c; c = *input++; } } switch (state) { case 0: /* Waiting for (unescaped) $ */ if ((c == '\'') && (prev != '\\')) { state = 3; break; } if ((c == '$') && (prev != '\\')) { state++; } else { *(output++) = c; outputcnt--; } break; case 1: /* Waiting for ( */ if (c == '(' || c == '{') { state++; varname_start = input; } else { state = 0; *(output++) = '$'; outputcnt--; if (outputcnt) { *(output++) = c; outputcnt--; } } break; case 2: /* Waiting for ) */ if (c == ')' || c == '}') { int i; char envname[CONFIG_SYS_CBSIZE], *envval; /* Varname # of chars */ int envcnt = input - varname_start - 1; /* Get the varname */ for (i = 0; i < envcnt; i++) envname[i] = varname_start[i]; envname[i] = 0; /* Get its value */ |
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envval = env_get(envname); |
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/* Copy into the line if it exists */ if (envval != NULL) while ((*envval) && outputcnt) { *(output++) = *(envval++); outputcnt--; } /* Look for another '$' */ state = 0; } break; case 3: /* Waiting for ' */ if ((c == '\'') && (prev != '\\')) { state = 0; } else { *(output++) = c; outputcnt--; } break; } prev = c; } if (outputcnt) *output = 0; else *(output - 1) = 0; debug_parser("[PROCESS_MACROS] OUTPUT len %zd: \"%s\" ", strlen(output_start), output_start); } /* * WARNING: * * 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 * creates or modifies environment variables (like "bootp" does). */ int cli_simple_run_command(const char *cmd, int flag) { char cmdbuf[CONFIG_SYS_CBSIZE]; /* working copy of cmd */ char *token; /* start of token in cmdbuf */ char *sep; /* end of token (separator) in cmdbuf */ char finaltoken[CONFIG_SYS_CBSIZE]; char *str = cmdbuf; char *argv[CONFIG_SYS_MAXARGS + 1]; /* NULL terminated */ int argc, inquotes; int repeatable = 1; int rc = 0; debug_parser("[RUN_COMMAND] cmd[%p]=\"", cmd); if (DEBUG_PARSER) { /* use puts - string may be loooong */ puts(cmd ? cmd : "NULL"); puts("\" "); } clear_ctrlc(); /* forget any previous Control C */ if (!cmd || !*cmd) return -1; /* empty command */ if (strlen(cmd) >= CONFIG_SYS_CBSIZE) { puts("## Command too long! "); return -1; } strcpy(cmdbuf, cmd); /* Process separators and check for invalid * repeatable commands */ debug_parser("[PROCESS_SEPARATORS] %s ", cmd); while (*str) { /* * Find separator, or string end * Allow simple escape of ';' by writing "\;" */ for (inquotes = 0, sep = str; *sep; sep++) { if ((*sep == '\'') && (*(sep - 1) != '\\')) inquotes = !inquotes; if (!inquotes && (*sep == ';') && /* separator */ (sep != str) && /* past string start */ (*(sep - 1) != '\\')) /* and NOT escaped */ break; } /* * Limit the token to data between separators */ token = str; if (*sep) { str = sep + 1; /* start of command for next pass */ *sep = '\0'; } else { str = sep; /* no more commands for next pass */ } debug_parser("token: \"%s\" ", token); /* 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) { rc = -1; /* no command at all */ continue; } if (cmd_process(flag, argc, argv, &repeatable, NULL)) rc = -1; /* Did the user stop this? */ if (had_ctrlc()) return -1; /* if stopped then not repeatable */ } return rc ? rc : repeatable; } |
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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; int flag; int rc = 1; for (;;) { |
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if (rc >= 0) { /* Saw enough of a valid command to * restart the timeout. */ |
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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 */ if (len > 0) |
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strlcpy(lastcommand, console_buffer, CONFIG_SYS_CBSIZE + 1); |
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else if (len == 0) flag |= CMD_FLAG_REPEAT; #ifdef CONFIG_BOOT_RETRY_TIME else if (len == -2) { /* -2 means timed out, retry autoboot */ puts(" Timed out waiting for command "); # ifdef CONFIG_RESET_TO_RETRY /* Reinit board to run initialization code again */ do_reset(NULL, 0, 0, NULL); # else return; /* retry autoboot */ # endif } #endif if (len == -1) puts("<INTERRUPT> "); else |
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rc = run_command_repeatable(lastcommand, flag); |
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if (rc <= 0) { /* invalid command or not repeatable, forget it */ lastcommand[0] = 0; } } } int cli_simple_run_command_list(char *cmd, int flag) { char *line, *next; int rcode = 0; /* * Break into individual lines, and execute each line; terminate on * error. */ next = cmd; line = cmd; while (*next) { if (*next == ' ') { *next = '\0'; /* run only non-empty commands */ if (*line) { debug("** exec: \"%s\" ", line); if (cli_simple_run_command(line, 0) < 0) { rcode = 1; break; } } line = next + 1; } ++next; } if (rcode == 0 && *line) |
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rcode = (cli_simple_run_command(line, 0) < 0); |
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return rcode; } |