| 1 | #include "config.h"
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| 2 | #include "f2c.h"
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| 3 | #include "fio.h"
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| 4 |
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| 5 | #include <sys/types.h>
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| 6 | #include <unistd.h>
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| 7 |
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| 8 | #undef abs
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| 9 | #undef min
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| 10 | #undef max
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| 11 | #include <stdlib.h>
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| 12 | #include <string.h>
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| 13 |
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| 14 | extern char *f__r_mode[], *f__w_mode[];
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| 15 |
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| 16 | integer
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| 17 | f_end (alist * a)
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| 18 | {
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| 19 | unit *b;
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| 20 | FILE *tf;
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| 21 |
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| 22 | if (f__init & 2)
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| 23 | f__fatal (131, "I/O recursion");
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| 24 | if (a->aunit >= MXUNIT || a->aunit < 0)
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| 25 | err (a->aerr, 101, "endfile");
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| 26 | b = &f__units[a->aunit];
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| 27 | if (b->ufd == NULL)
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| 28 | {
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| 29 | char nbuf[10];
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| 30 | sprintf (nbuf, "fort.%ld", (long) a->aunit);
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| 31 | if ((tf = fopen (nbuf, f__w_mode[0])))
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| 32 | fclose (tf);
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| 33 | return (0);
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| 34 | }
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| 35 | b->uend = 1;
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| 36 | return (b->useek ? t_runc (a) : 0);
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| 37 | }
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| 38 |
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| 39 | #ifndef HAVE_FTRUNCATE
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| 40 | static int
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| 41 | copy (FILE * from, register long len, FILE * to)
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| 42 | {
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| 43 | int len1;
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| 44 | char buf[BUFSIZ];
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| 45 |
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| 46 | while (fread (buf, len1 = len > BUFSIZ ? BUFSIZ : (int) len, 1, from))
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| 47 | {
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| 48 | if (!fwrite (buf, len1, 1, to))
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| 49 | return 1;
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| 50 | if ((len -= len1) <= 0)
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| 51 | break;
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| 52 | }
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| 53 | return 0;
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| 54 | }
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| 55 | #endif /* !defined(HAVE_FTRUNCATE) */
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| 56 |
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| 57 | int
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| 58 | t_runc (alist * a)
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| 59 | {
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| 60 | off_t loc, len;
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| 61 | unit *b;
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| 62 | int rc;
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| 63 | FILE *bf;
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| 64 | #ifndef HAVE_FTRUNCATE
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| 65 | FILE *tf;
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| 66 | #endif /* !defined(HAVE_FTRUNCATE) */
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| 67 |
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| 68 | b = &f__units[a->aunit];
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| 69 | if (b->url)
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| 70 | return (0); /*don't truncate direct files */
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| 71 | loc = FTELL (bf = b->ufd);
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| 72 | FSEEK (bf, 0, SEEK_END);
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| 73 | len = FTELL (bf);
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| 74 | if (loc >= len || b->useek == 0 || b->ufnm == NULL)
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| 75 | return (0);
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| 76 | #ifndef HAVE_FTRUNCATE
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| 77 | rc = 0;
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| 78 | fclose (b->ufd);
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| 79 | if (!loc)
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| 80 | {
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| 81 | if (!(bf = fopen (b->ufnm, f__w_mode[b->ufmt])))
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| 82 | rc = 1;
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| 83 | if (b->uwrt)
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| 84 | b->uwrt = 1;
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| 85 | goto done;
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| 86 | }
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| 87 | if (!(bf = fopen (b->ufnm, f__r_mode[0])) || !(tf = tmpfile ()))
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| 88 | {
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| 89 | #ifdef NON_UNIX_STDIO
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| 90 | bad:
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| 91 | #endif
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| 92 | rc = 1;
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| 93 | goto done;
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| 94 | }
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| 95 | if (copy (bf, loc, tf))
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| 96 | {
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| 97 | bad1:
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| 98 | rc = 1;
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| 99 | goto done1;
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| 100 | }
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| 101 | if (!(bf = freopen (b->ufnm, f__w_mode[0], bf)))
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| 102 | goto bad1;
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| 103 | FSEEK (tf, 0, SEEK_SET);
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| 104 | if (copy (tf, loc, bf))
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| 105 | goto bad1;
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| 106 | b->uwrt = 1;
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| 107 | b->urw = 2;
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| 108 | #ifdef NON_UNIX_STDIO
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| 109 | if (b->ufmt)
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| 110 | {
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| 111 | fclose (bf);
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| 112 | if (!(bf = fopen (b->ufnm, f__w_mode[3])))
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| 113 | goto bad;
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| 114 | FSEEK (bf, 0, SEEK_END);
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| 115 | b->urw = 3;
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| 116 | }
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| 117 | #endif
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| 118 | done1:
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| 119 | fclose (tf);
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| 120 | done:
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| 121 | f__cf = b->ufd = bf;
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| 122 | #else /* !defined(HAVE_FTRUNCATE) */
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| 123 | fflush (b->ufd);
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| 124 | rc = ftruncate (fileno (b->ufd), loc);
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| 125 | FSEEK (bf, loc, SEEK_SET);
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| 126 | #endif /* !defined(HAVE_FTRUNCATE) */
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| 127 | if (rc)
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| 128 | err (a->aerr, 111, "endfile");
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| 129 | return 0;
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| 130 | }
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