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Annotation of embedaddon/sudo/compat/getline.c, revision 1.1.1.2

1.1       misho       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;
1.1.1.2 ! misho      55:        if (bufsize == 0 || bufsize - 1 < len) {
1.1       misho      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