1/* vi: set sw=4 ts=4: */ 2/* 3 * Utility routines. 4 * 5 * Copyright (C) 2005, 2006 Rob Landley <rob@landley.net> 6 * Copyright (C) 2004 Erik Andersen <andersen@codepoet.org> 7 * Copyright (C) 2001 Matt Krai 8 * 9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 10 */ 11 12#include "libbb.h" 13 14/* This function reads an entire line from a text file, up to a newline 15 * or NUL byte, inclusive. It returns a malloc'ed char * which must be 16 * stored and free'ed by the caller. If end is NULL '\n' isn't considered 17 * end of line. If end isn't NULL, length of the chunk read is stored in it. 18 * Return NULL if EOF/error */ 19 20char *bb_get_chunk_from_file(FILE *file, int *end) 21{ 22 int ch; 23 int idx = 0; 24 char *linebuf = NULL; 25 int linebufsz = 0; 26 27 while ((ch = getc(file)) != EOF) { 28 /* grow the line buffer as necessary */ 29 if (idx >= linebufsz) { 30 linebufsz += 80; 31 linebuf = xrealloc(linebuf, linebufsz); 32 } 33 linebuf[idx++] = (char) ch; 34 if (!ch || (end && ch == '\n')) 35 break; 36 } 37 if (end) 38 *end = idx; 39 if (linebuf) { 40 // huh, does fgets discard prior data on error like this? 41 // I don't think so.... 42 //if (ferror(file)) { 43 // free(linebuf); 44 // return NULL; 45 //} 46 linebuf = xrealloc(linebuf, idx+1); 47 linebuf[idx] = '\0'; 48 } 49 return linebuf; 50} 51 52/* Get line, including trailing \n if any */ 53char *xmalloc_fgets(FILE *file) 54{ 55 int i; 56 57 return bb_get_chunk_from_file(file, &i); 58} 59 60/* Get line. Remove trailing \n */ 61char *xmalloc_getline(FILE *file) 62{ 63 int i; 64 char *c = bb_get_chunk_from_file(file, &i); 65 66 if (i && c[--i] == '\n') 67 c[i] = '\0'; 68 69 return c; 70} 71