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Diffstat (limited to 'busybox/libbb/read_package_field.c')
| -rw-r--r-- | busybox/libbb/read_package_field.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/busybox/libbb/read_package_field.c b/busybox/libbb/read_package_field.c new file mode 100644 index 0000000..4292689 --- /dev/null +++ b/busybox/libbb/read_package_field.c @@ -0,0 +1,114 @@ +/* vi: set sw=4 ts=4: */ +/* + * Utility routines. + * + * Copyright (C) many different people. + * If you wrote this, please acknowledge your work. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + * USA + */ + +#include <stdlib.h> +#include <string.h> +#include "libbb.h" + +/* + * Gets the next package field from package_buffer, seperated into the field name + * and field value, it returns the int offset to the first character of the next field + */ +int read_package_field(const char *package_buffer, char **field_name, char **field_value) +{ + int offset_name_start = 0; + int offset_name_end = 0; + int offset_value_start = 0; + int offset_value_end = 0; + int offset = 0; + int next_offset; + int name_length; + int value_length; + int exit_flag = FALSE; + + if (package_buffer == NULL) { + *field_name = NULL; + *field_value = NULL; + return(-1); + } + while (1) { + next_offset = offset + 1; + switch (package_buffer[offset]) { + case('\0'): + exit_flag = TRUE; + break; + case(':'): + if (offset_name_end == 0) { + offset_name_end = offset; + offset_value_start = next_offset; + } + /* TODO: Name might still have trailing spaces if ':' isnt + * immediately after name */ + break; + case('\n'): + /* TODO: The char next_offset may be out of bounds */ + if (package_buffer[next_offset] != ' ') { + exit_flag = TRUE; + break; + } + case('\t'): + case(' '): + /* increment the value start point if its a just filler */ + if (offset_name_start == offset) { + offset_name_start++; + } + if (offset_value_start == offset) { + offset_value_start++; + } + break; + } + if (exit_flag) { + /* Check that the names are valid */ + offset_value_end = offset; + name_length = offset_name_end - offset_name_start; + value_length = offset_value_end - offset_value_start; + if (name_length == 0) { + break; + } + if ((name_length > 0) && (value_length > 0)) { + break; + } + + /* If not valid, start fresh with next field */ + exit_flag = FALSE; + offset_name_start = offset + 1; + offset_name_end = 0; + offset_value_start = offset + 1; + offset_value_end = offset + 1; + offset++; + } + offset++; + } + if (name_length == 0) { + *field_name = NULL; + } else { + *field_name = bb_xstrndup(&package_buffer[offset_name_start], name_length); + } + if (value_length > 0) { + *field_value = bb_xstrndup(&package_buffer[offset_value_start], value_length); + } else { + *field_value = NULL; + } + return(next_offset); +} + |