1/* 2 * This file is part of aMule. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the 16 * Free Software Foundation, Inc., 17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA 18 */ 19 20#include <stdio.h> 21#include <stdlib.h> 22#include <stdarg.h> 23#include <string.h> 24 25#include "lines.h" 26 27void CreateLine(char *lines[], int line, const char *format, ...) 28{ 29 /* Guess we need no more than 80 bytes. */ 30 int n, size = 100; 31 char *p; 32 va_list ap; 33 if ((p = malloc(size)) == NULL) { 34 lines[line] = NULL; 35 return; 36 } 37 while (1) { 38 /* Try to print in the allocated space. */ 39 va_start(ap, format); 40 n = vsnprintf(p, size, format, ap); 41 va_end(ap); 42 /* If that worked, set the line. */ 43 if (n > -1 && n < size) { 44 lines[line] = p; 45 return; 46 } 47 /* Else try again with more space. */ 48 if (n > -1) /* glibc 2.1 */ 49 size = n+1; /* precisely what is needed */ 50 else /* glibc 2.0 */ 51 size *= 2; /* twice the old size */ 52 if ((p = realloc(p, size)) == NULL) { 53 lines[line] = NULL; 54 return; 55 } 56 } 57} 58 59void AppendToLine(char *lines[], int line, const char *text) 60{ 61 /* Are we trying to append to an empty line? */ 62 if (lines[line] == NULL) 63 CreateLine(lines, line, text); 64 else { 65 /* Calculate the new required size... */ 66 int size = strlen(lines[line]) + strlen(text) + 1; 67 if ((lines[line] = realloc(lines[line], size)) == NULL) 68 return; 69 /* ... and append the new text. */ 70 strcat(lines[line], text); 71 } 72} 73