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    1: /*
    2:  * Copyright (c) 2009-2010 Todd C. Miller <Todd.Miller@courtesan.com>
    3:  *
    4:  * Permission to use, copy, modify, and distribute this software for any
    5:  * purpose with or without fee is hereby granted, provided that the above
    6:  * copyright notice and this permission notice appear in all copies.
    7:  *
    8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   15:  */
   16: 
   17: #include <config.h>
   18: 
   19: #include <sys/types.h>
   20: 
   21: #include <stdio.h>
   22: #ifdef STDC_HEADERS
   23: # include <stdlib.h>
   24: # include <stddef.h>
   25: #else
   26: # ifdef HAVE_STDLIB_H
   27: #  include <stdlib.h>
   28: # endif
   29: #endif /* STDC_HEADERS */
   30: #ifdef HAVE_STRING_H
   31: # include <string.h>
   32: #endif /* HAVE_STRING_H */
   33: #ifdef HAVE_STRINGS_H
   34: # include <strings.h>
   35: #endif /* HAVE_STRINGS_H */
   36: #include <limits.h>
   37: 
   38: #include "missing.h"
   39: 
   40: #ifndef LINE_MAX
   41: # define LINE_MAX 2048
   42: #endif
   43: 
   44: #ifdef HAVE_FGETLN
   45: ssize_t
   46: getline(char **bufp, size_t *bufsizep, FILE *fp)
   47: {
   48:     char *buf, *cp;
   49:     size_t bufsize;
   50:     size_t len;
   51: 
   52:     buf = fgetln(fp, &len);
   53:     if (buf) {
   54: 	bufsize = *bufp ? *bufsizep : 0;
   55: 	if (bufsize < len + 1) {
   56: 	    bufsize = len + 1;
   57: 	    cp = *bufp ? realloc(*bufp, bufsize) : malloc(bufsize);
   58: 	    if (cp == NULL)
   59: 		return -1;
   60: 	    *bufp = cp;
   61: 	    *bufsizep = bufsize;
   62: 	}
   63: 	memcpy(*bufp, buf, len);
   64: 	(*bufp)[len] = '\0';
   65:     }
   66:     return buf ? len : -1;
   67: }
   68: #else
   69: ssize_t
   70: getline(char **bufp, size_t *bufsizep, FILE *fp)
   71: {
   72:     char *buf, *cp;
   73:     size_t bufsize;
   74:     ssize_t len = 0;
   75: 
   76:     buf = *bufp;
   77:     bufsize = *bufsizep;
   78:     if (buf == NULL || bufsize == 0) {
   79: 	bufsize = LINE_MAX;
   80: 	cp = buf ? realloc(buf, bufsize) : malloc(bufsize);
   81: 	if (cp == NULL)
   82: 	    return -1;
   83: 	buf = cp;
   84:     }
   85: 
   86:     for (;;) {
   87: 	if (fgets(buf + len, bufsize - len, fp) == NULL) {
   88: 	    len = -1;
   89: 	    break;
   90: 	}
   91: 	len = strlen(buf);
   92: 	if (!len || buf[len - 1] == '\n' || feof(fp))
   93: 	    break;
   94: 	bufsize *= 2;
   95: 	cp = realloc(buf, bufsize);
   96: 	if (cp == NULL)
   97: 	    return -1;
   98: 	buf = cp;
   99:     }
  100:     *bufp = buf;
  101:     *bufsizep = bufsize;
  102:     return len;
  103: }
  104: #endif