| 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 2 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, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * 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, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 18 | * USA |
| 19 | */ |
| 20 | /** @file lib/sink.c |
| 21 | * @brief Abstract output sink type |
| 22 | */ |
| 23 | |
| 24 | #include <config.h> |
| 25 | #include "types.h" |
| 26 | |
| 27 | #include <stdio.h> |
| 28 | #include <stdarg.h> |
| 29 | #include <string.h> |
| 30 | #include <errno.h> |
| 31 | |
| 32 | #include "mem.h" |
| 33 | #include "vector.h" |
| 34 | #include "sink.h" |
| 35 | #include "log.h" |
| 36 | #include "printf.h" |
| 37 | |
| 38 | /** @brief Formatted output to a sink |
| 39 | * @param s Sink to write to |
| 40 | * @param fmt Format string |
| 41 | * @param ap Argument list |
| 42 | * @return Number of bytes written on success, -1 on error |
| 43 | */ |
| 44 | int sink_vprintf(struct sink *s, const char *fmt, va_list ap) { |
| 45 | return byte_vsinkprintf(s, fmt, ap); |
| 46 | } |
| 47 | |
| 48 | /** @brief Formatted output to a sink |
| 49 | * @param s Sink to write to |
| 50 | * @param fmt Format string |
| 51 | * @return Number of bytes written on success, -1 on error |
| 52 | */ |
| 53 | int sink_printf(struct sink *s, const char *fmt, ...) { |
| 54 | va_list ap; |
| 55 | int n; |
| 56 | |
| 57 | va_start(ap, fmt); |
| 58 | n = byte_vsinkprintf(s, fmt, ap); |
| 59 | va_end(ap); |
| 60 | return n; |
| 61 | } |
| 62 | |
| 63 | /* stdio sink *****************************************************************/ |
| 64 | |
| 65 | /** @brief Sink that writes to a stdio @c FILE */ |
| 66 | struct stdio_sink { |
| 67 | /** @brief Base member */ |
| 68 | struct sink s; |
| 69 | |
| 70 | /** @brief Filename */ |
| 71 | const char *name; |
| 72 | |
| 73 | /** @brief Stream to write to */ |
| 74 | FILE *fp; |
| 75 | }; |
| 76 | |
| 77 | /** @brief Reinterpret a @ref sink as a @ref stdio_sink */ |
| 78 | #define S(s) ((struct stdio_sink *)s) |
| 79 | |
| 80 | /** @brief Write callback for @ref stdio_sink */ |
| 81 | static int sink_stdio_write(struct sink *s, const void *buffer, int nbytes) { |
| 82 | int n = fwrite(buffer, 1, nbytes, S(s)->fp); |
| 83 | if(n < nbytes) { |
| 84 | if(S(s)->name) |
| 85 | fatal(errno, "error writing to %s", S(s)->name); |
| 86 | else |
| 87 | return -1; |
| 88 | } |
| 89 | return n; |
| 90 | } |
| 91 | |
| 92 | /** @brief Create a sink that writes to a stdio stream |
| 93 | * @param name Filename for use in error messages |
| 94 | * @param fp Stream to write to |
| 95 | * @return Pointer to new sink |
| 96 | */ |
| 97 | struct sink *sink_stdio(const char *name, FILE *fp) { |
| 98 | struct stdio_sink *s = xmalloc(sizeof *s); |
| 99 | |
| 100 | s->s.write = sink_stdio_write; |
| 101 | s->name = name; |
| 102 | s->fp = fp; |
| 103 | return (struct sink *)s; |
| 104 | } |
| 105 | |
| 106 | /* dynstr sink ****************************************************************/ |
| 107 | |
| 108 | /** @brief Sink that writes to a dynamic string */ |
| 109 | struct dynstr_sink { |
| 110 | /** @brief Base member */ |
| 111 | struct sink s; |
| 112 | /** @brief Pointer to dynamic string to append to */ |
| 113 | struct dynstr *d; |
| 114 | }; |
| 115 | |
| 116 | /** @brief Write callback for @ref dynstr_sink */ |
| 117 | static int sink_dynstr_write(struct sink *s, const void *buffer, int nbytes) { |
| 118 | dynstr_append_bytes(((struct dynstr_sink *)s)->d, buffer, nbytes); |
| 119 | return nbytes; |
| 120 | } |
| 121 | |
| 122 | /** @brief Create a sink that appends to a @ref dynstr |
| 123 | * @param output Dynamic string to append to |
| 124 | * @return Pointer to new sink |
| 125 | */ |
| 126 | struct sink *sink_dynstr(struct dynstr *output) { |
| 127 | struct dynstr_sink *s = xmalloc(sizeof *s); |
| 128 | |
| 129 | s->s.write = sink_dynstr_write; |
| 130 | s->d = output; |
| 131 | return (struct sink *)s; |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | Local Variables: |
| 136 | c-basic-offset:2 |
| 137 | comment-column:40 |
| 138 | End: |
| 139 | */ |