| Stefan Reinauer | e5d30b7 | 2010-03-25 22:15:19 +0000 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the libpayload project. |
| 3 | * |
| 4 | * Copyright (C) 2008 coresystems GmbH |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | /** |
| 31 | * @file libc/readline.c |
| 32 | * Simple readline implementation |
| 33 | */ |
| 34 | |
| 35 | #include <libpayload.h> |
| 36 | #include <getopt.h> |
| 37 | |
| Stefan Reinauer | 14e2277 | 2010-04-27 06:56:47 +0000 | [diff] [blame] | 38 | /* We don't want to waste malloc on this, so we live with a small |
| 39 | * fixed size array |
| Stefan Reinauer | e5d30b7 | 2010-03-25 22:15:19 +0000 | [diff] [blame] | 40 | */ |
| 41 | char *string_argv[MAX_ARGS]; |
| 42 | int string_argc; |
| 43 | |
| 44 | /** |
| 45 | * Take a string and make char *argv[] and int argc from it. |
| 46 | * |
| 47 | * This function allows the user to use getopt on an arbitrary string. |
| 48 | * |
| 49 | * global variables valid after a successful run of string_to_args(): |
| 50 | * string_argc pointer to number of arguments |
| 51 | * string_argv pointer to argument list. |
| 52 | * |
| 53 | * @param caller to be used as argv[0] (may be NULL to ignore) |
| 54 | * @param string to process |
| 55 | * @return 0 if no error occured. |
| 56 | */ |
| 57 | int string_to_args(char *caller, char *string) |
| 58 | { |
| 59 | int i = 0; |
| 60 | |
| 61 | if (caller) |
| 62 | string_argv[i++] = caller; |
| 63 | |
| 64 | if (*string) |
| 65 | string_argv[i++] = string; |
| 66 | |
| 67 | /* Terminate if the string ends */ |
| 68 | while (string && *string) { |
| 69 | /* whitespace occured? */ |
| 70 | if ((*string == ' ') || (*string == '\t')) { |
| 71 | /* skip all whitespace (and null it) */ |
| 72 | while (*string == ' ' || *string == '\t') |
| 73 | *string++ = 0; |
| 74 | /* if our ugly static array is big enough, store |
| 75 | * argument to string_argv[] |
| 76 | */ |
| 77 | if (i < MAX_ARGS) |
| 78 | string_argv[i++] = string; |
| 79 | } |
| 80 | string++; |
| 81 | } |
| 82 | |
| 83 | /* prevent array from overflowing */ |
| 84 | string_argc = (i <= MAX_ARGS) ? i : MAX_ARGS; |
| 85 | |
| 86 | /* and return whether there was an overflow */ |
| 87 | return (i <= MAX_ARGS) ? 0 : 1; |
| 88 | } |