io.h

   1 /* Copyright (c) 2006-2010 Jonas Fonseca <fonseca@diku.dk>
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License as
   5  * published by the Free Software Foundation; either version 2 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #ifndef TIG_IO_H
  15 #define TIG_IO_H
  16
  17 /*
  18  * Argument array helpers.
  19  */
  20
  21 bool argv_from_string(const char *argv[SIZEOF_ARG], int *argc, char *cmd);
  22 bool argv_from_env(const char **argv, const char *name);
  23 void argv_free(const char *argv[]);
  24 size_t argv_size(const char **argv);
  25 bool argv_append(const char ***argv, const char *arg);
  26 bool argv_append_array(const char ***dst_argv, const char *src_argv[]);
  27 bool argv_copy(const char ***dst, const char *src[]);
  28
  29 /*
  30  * Executing external commands.
  31  */
  32
  33 enum io_type {
  34         IO_FD,                  /* File descriptor based IO. */
  35         IO_BG,                  /* Execute command in the background. */
  36         IO_FG,                  /* Execute command with same std{in,out,err}. */
  37         IO_RD,                  /* Read only fork+exec IO. */
  38         IO_WR,                  /* Write only fork+exec IO. */
  39         IO_AP,                  /* Append fork+exec output to file. */
  40 };
  41
  42 struct io {
  43         int pipe;               /* Pipe end for reading or writing. */
  44         pid_t pid;              /* PID of spawned process. */
  45         int error;              /* Error status. */
  46         char *buf;              /* Read buffer. */
  47         size_t bufalloc;        /* Allocated buffer size. */
  48         size_t bufsize;         /* Buffer content size. */
  49         char *bufpos;           /* Current buffer position. */
  50         unsigned int eof:1;     /* Has end of file been reached. */
  51 };
  52
  53 typedef int (*io_read_fn)(char *, size_t, char *, size_t, void *data);
  54
  55 bool io_open(struct io *io, const char *fmt, ...);
  56 bool io_kill(struct io *io);
  57 bool io_done(struct io *io);
  58 bool io_run(struct io *io, enum io_type type, const char *dir, const char *argv[], ...);
  59 bool io_run_bg(const char **argv);
  60 bool io_run_fg(const char **argv, const char *dir);
  61 bool io_run_append(const char **argv, int fd);
  62 bool io_eof(struct io *io);
  63 int io_error(struct io *io);
  64 char * io_strerror(struct io *io);
  65 bool io_can_read(struct io *io, bool can_block);
  66 ssize_t io_read(struct io *io, void *buf, size_t bufsize);
  67 char * io_get(struct io *io, int c, bool can_read);
  68 bool io_write(struct io *io, const void *buf, size_t bufsize);
  69 bool io_read_buf(struct io *io, char buf[], size_t bufsize);
  70 bool io_run_buf(const char **argv, char buf[], size_t bufsize);
  71 int io_load(struct io *io, const char *separators,
  72             io_read_fn read_property, void *data);
  73 int io_run_load(const char **argv, const char *separators,
  74                 io_read_fn read_property, void *data);
  75
  76 #endif