| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004, 2007, 2008 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software: you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file lib/inputline.c |
| 19 | * @brief Line input |
| 20 | */ |
| 21 | |
| 22 | #include "common.h" |
| 23 | |
| 24 | #include <errno.h> |
| 25 | |
| 26 | #include "log.h" |
| 27 | #include "mem.h" |
| 28 | #include "vector.h" |
| 29 | #include "charset.h" |
| 30 | #include "inputline.h" |
| 31 | |
| 32 | /** @brief Read a line from @p fp |
| 33 | * @param tag Used in error messages |
| 34 | * @param fp Stream to read from |
| 35 | * @param lp Where to store newly allocated string |
| 36 | * @param newline Newline character or @ref CRLF |
| 37 | * @return 0 on success, -1 on error or eof. |
| 38 | * |
| 39 | * The newline is not included in the string. If the last line of a |
| 40 | * stream does not have a newline then that line is still returned. |
| 41 | * |
| 42 | * If @p newline is @ref CRLF then the line is terminated by CR LF, |
| 43 | * not by a single newline character. The CRLF is still not included |
| 44 | * in the string in this case. |
| 45 | * |
| 46 | * @p *lp is only set if the return value was 0. |
| 47 | */ |
| 48 | int inputline(const char *tag, FILE *fp, char **lp, int newline) { |
| 49 | struct dynstr d; |
| 50 | int ch; |
| 51 | |
| 52 | dynstr_init(&d); |
| 53 | while((ch = getc(fp)), |
| 54 | (!ferror(fp) && !feof(fp) && ch != newline)) { |
| 55 | dynstr_append(&d, ch); |
| 56 | if(newline == CRLF && d.nvec >= 2 |
| 57 | && d.vec[d.nvec - 2] == 0x0D && d.vec[d.nvec - 1] == 0x0A) { |
| 58 | d.nvec -= 2; |
| 59 | break; |
| 60 | } |
| 61 | } |
| 62 | if(ferror(fp)) { |
| 63 | disorder_error(errno, "error reading %s", tag); |
| 64 | return -1; |
| 65 | } else if(feof(fp)) { |
| 66 | if(d.nvec != 0) |
| 67 | disorder_error(0, "error reading %s: unexpected EOF", tag); |
| 68 | return -1; |
| 69 | } |
| 70 | dynstr_terminate(&d); |
| 71 | *lp = d.vec; |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | Local Variables: |
| 77 | c-basic-offset:2 |
| 78 | comment-column:40 |
| 79 | End: |
| 80 | */ |