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Diffstat (limited to 'inc/string_buffer.h')
| -rw-r--r-- | inc/string_buffer.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/inc/string_buffer.h b/inc/string_buffer.h new file mode 100644 index 0000000..1deeb51 --- /dev/null +++ b/inc/string_buffer.h @@ -0,0 +1,105 @@ +/** ************************************************************************** + * string_buffer.h + * + * Copyright 2008 Bryan Ischo <bryan@ischo.com> + * + * 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., + * 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + * + ************************************************************************** **/ + +#ifndef STRING_BUFFER_H +#define STRING_BUFFER_H + +#include <stdio.h> + + +// Declare a string_buffer with the given name of the given maximum length +#define string_buffer(name, len) \ + char name[len + 1]; \ + int name##Len + + +// Initialize a string_buffer +#define string_buffer_initialize(sb) \ + do { \ + sb[0] = 0; \ + sb##Len = 0; \ + } while (0) + + +// Append [len] bytes of [str] to [sb], setting [all_fit] to 1 if it fit, and +// 0 if it did not +#define string_buffer_append(sb, str, len, all_fit) \ + do { \ + sb##Len += snprintf(&(sb[sb##Len]), sizeof(sb) - sb##Len - 1, \ + "%.*s", len, str); \ + if (sb##Len > (sizeof(sb) - 1)) { \ + sb##Len = sizeof(sb) - 1; \ + all_fit = 0; \ + } \ + else { \ + all_fit = 1; \ + } \ + } while (0) + + +// Declare a string multibuffer with the given name of the given maximum size +#define string_multibuffer(name, size) \ + char name[size]; \ + int name##Size + + +// Initialize a string_multibuffer +#define string_multibuffer_initialize(smb) \ + do { \ + smb##Size = 0; \ + } while (0) + + +// Evaluates to the current string within the string_multibuffer +#define string_multibuffer_current(smb) \ + &(smb[smb##Size]) + + +// Adds a new string to the string_multibuffer +#define string_multibuffer_add(smb, str, len, all_fit) \ + do { \ + smb##Size += (snprintf(&(smb[smb##Size]), \ + sizeof(smb) - smb##Size, \ + "%.*s", len, str) + 1); \ + if (smb##Size > sizeof(smb)) { \ + smb##Size = sizeof(smb); \ + all_fit = 0; \ + } \ + else { \ + all_fit = 1; \ + } \ + } while (0) + + +// Appends to the current string in the string_multibuffer. There must be a +// current string, meaning that string_multibuffer_add must have been called +// at least once for this string_multibuffer. +#define string_multibuffer_append(smb, str, len, all_fit) \ + do { \ + smb##Size--; \ + string_multibuffer_add(smb, str, len, all_fit); \ + } while (0) + + +#endif /* STRING_BUFFER_H */ |