102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*
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* Copyright (c) 2014, 2022 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* proper-sh.c
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* Forward execution to the best shell.
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*/
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#include <err.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static bool is_supported(int argc, char* argv[])
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{
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int i;
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for ( i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( (arg[0] != '-' && arg[0] != '+') || !arg[1] )
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break; // Intentionally not continue and note '+' support.
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[0] == '+' || arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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case 'e': break;
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case 'i': break;
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case 'l': break;
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case 's': break;
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default: return false;
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}
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}
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else if ( !strcmp(arg, "--help") )
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;
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else if ( !strcmp(arg, "--version") )
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;
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else
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return false;
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}
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return i == argc;
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}
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int main(int argc, char* argv[])
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{
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if ( !isatty(0) || !isatty(1) || !is_supported(argc, argv) )
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{
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const char* env = getenv("SORTIX_SH_BACKEND");
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if ( env && env[0] )
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{
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execvp(env, argv);
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if ( errno != ENOENT )
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err(127, "%s", env);
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}
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FILE* fp = fopen("/etc/proper-sh", "r");
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if ( !fp && errno != ENOENT )
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err(127, "/etc/proper-sh");
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if ( fp )
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{
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char* proper_sh = NULL;
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size_t proper_sh_size = 0;
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ssize_t proper_sh_length = getline(&proper_sh, &proper_sh_size, fp);
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if ( proper_sh_length < 0 )
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err(127, "/etc/proper-sh");
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if ( proper_sh_length && proper_sh[proper_sh_length - 1] == '\n' )
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proper_sh[--proper_sh_length] = '\0';
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if ( proper_sh[0] )
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{
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execvp(proper_sh, argv);
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if ( errno != ENOENT )
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err(127, "%s", proper_sh);
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}
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free(proper_sh);
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fclose(fp);
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}
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execvp("dash", argv);
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if ( errno != ENOENT )
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err(127, "dash");
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}
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execvp("sortix-sh", argv);
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err(127, "sortix-sh");
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}
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