1 /* $XConsortium: readfile.c,v 1.5 94/12/11 14:25:48 gildea Exp $ */
2 /*
3
4 Copyright (c) 1988, 1991 X Consortium
5
6 Permission is hereby granted, free of charge, to any person obtaining
7 a copy of this software and associated documentation files (the
8 "Software"), to deal in the Software without restriction, including
9 without limitation the rights to use, copy, modify, merge, publish,
10 distribute, sublicense, and/or sell copies of the Software, and to
11 permit persons to whom the Software is furnished to do so, subject to
12 the following conditions:
13
14 The above copyright notice and this permission notice shall be included
15 in all copies or substantial portions of the Software.
16
17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 OTHER DEALINGS IN THE SOFTWARE.
24
25 Except as contained in this notice, the name of the X Consortium shall
26 not be used in advertising or otherwise to promote the sale, use or
27 other dealings in this Software without prior written authorization
28 from the X Consortium.
29
30 */
31 /* $XFree86: xc/programs/xmessage/readfile.c,v 1.2 2000/02/14 19:21:04 dawes Exp $ */
32
33 #include <X11/Xos.h> /* for types.h */
34 #include <sys/stat.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37
38 #include "readfile.h"
39
40 /*
41 * get_data_from_file - read data from a file into a single buffer; meant
42 * for small files containing messages.
43 */
44 static char *
get_data_from_file(char * filename,int * len_return)45 get_data_from_file (char *filename, int *len_return)
46 {
47 FILE *fp;
48 struct stat statbuf;
49 char *cp;
50 int count;
51
52 if (stat (filename, &statbuf) != 0 || statbuf.st_size < 0) {
53 perror(filename);
54 return NULL;
55 }
56
57 cp = malloc (statbuf.st_size + 1);
58 if (!cp) {
59 fprintf(stderr, "cannot get memory for message file\n");
60 return NULL;
61 }
62
63 fp = fopen (filename, "r");
64 if (!fp) {
65 perror(filename);
66 (void) free (cp);
67 return NULL;
68 }
69
70 count = fread (cp, 1, statbuf.st_size, fp);
71 if (count == 0 && statbuf.st_size != 0) {
72 perror(filename);
73 (void) free (cp);
74 (void) fclose (fp);
75 return NULL;
76 }
77
78 cp[count] = '\0'; /* since we allocated one extra */
79 *len_return = count;
80 (void) fclose (fp);
81 return cp;
82 }
83
84 /*
85 * get_data_from_stdin - read data from stdin into a single buffer.
86 */
87 static char *
get_data_from_stdin(int * len_return)88 get_data_from_stdin (int *len_return)
89 {
90 char *cp;
91 int count;
92 int allocated;
93 int n;
94
95 allocated = BUFSIZ;
96 cp = malloc (allocated + 1);
97 if (!cp) {
98 fprintf(stderr, "cannot get memory for message file\n");
99 return NULL;
100 }
101 count = 0;
102
103 while ((n = fread (cp + count, 1, BUFSIZ, stdin)) > 0) {
104 count += n;
105 /* Here count <= allocated. Prepare for next round. */
106 if (count + BUFSIZ > allocated) {
107 char *oldp = cp;
108 allocated = 2 * allocated;
109 cp = realloc (cp, allocated + 1);
110 if (!cp) {
111 free(oldp);
112 fprintf(stderr, "cannot get memory for message file\n");
113 return NULL;
114 }
115 }
116 }
117
118 cp[count] = '\0'; /* since we allocated one extra */
119 *len_return = count;
120 return cp;
121 }
122
123
124 /*
125 * read_file - read data from indicated file and return pointer to malloced
126 * buffer. Returns NULL on error or if no such file.
127 */
128 char *
read_file(char * filename,int * len)129 read_file (char *filename, int *len /* returned */)
130 {
131 if (filename[0] == '-' && filename[1] == '\0') {
132 return (get_data_from_stdin (len));
133 } else {
134 return (get_data_from_file (filename, len));
135 }
136 }
137