/* * Copyright (C) 1989 by Kenneth Almquist. All rights reserved. * This file is part of ash, which is distributed under the terms specified * by the Ash General Public License. See the file named LICENSE. */ #include "shell.h" #include "options.h" #include "nodes.h" /* for other header files */ #include "eval.h" #include "jobs.h" #include "input.h" #include "output.h" #include "trap.h" #include "var.h" #include "memalloc.h" #include "error.h" #include "mystring.h" const char optchar[10] = "efIijnsxz"; /* shell flags */ char optval[10]; /* values of option flags */ char *arg0; /* value of $0 */ struct shparam shellparam; /* current positional parameters */ char **argptr; /* argument list for builtin commands */ char *optarg; /* set by nextopt (like getopt) */ char *optptr; /* used by nextopt */ char *minusc; /* argument to -c option */ #ifdef __STDC__ STATIC void options(int); STATIC void setoption(int, int); #else STATIC void options(); STATIC void setoption(); #endif /* * Process the shell command line arguments. */ void procargs(argc, argv) char **argv; { char *p; argptr = argv; if (argc > 0) argptr++; for (p = optval ; p < optval + sizeof optval - 1 ; p++) *p = 2; options(1); if (*argptr == NULL && minusc == NULL) sflag = 1; if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1)) iflag = 1; if (jflag == 2) jflag = iflag; for (p = optval ; p < optval + sizeof optval - 1 ; p++) if (*p == 2) *p = 0; arg0 = argv[0]; if (sflag == 0 && minusc == NULL) { commandname = arg0 = *argptr++; setinputfile(commandname, 0); } shellparam.p = argptr; /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ while (*argptr) { shellparam.nparam++; argptr++; } setinteractive(iflag); setjobctl(jflag); } /* * Process shell options. The global variable argptr contains a pointer * to the argument list; we advance it past the options. */ STATIC void options(cmdline) { register char *p; int val; int c; minusc = NULL; while ((p = *argptr) != NULL) { argptr++; if ((c = *p++) == '-') { val = 1; if (p[0] == '-' && p[1] == '\0') break; /* "--" terminates options */ } else if (c == '+') { val = 0; } else { argptr--; break; } while ((c = *p++) != '\0') { if (c == 'c' && cmdline) { if (*p == '\0') p = *argptr++; if (p == NULL || minusc != NULL) error("Bad -c option"); minusc = p; break; } else { setoption(c, val); } } if (! cmdline) break; } } STATIC void setoption(flag, val) char flag; int val; { register char *p; if ((p = strchr(optchar, flag)) == NULL) error("Illegal option -%c", flag); optval[p - optchar] = val; } #ifdef mkinit INCLUDE "options.h" SHELLPROC { char *p; for (p = optval ; p < optval + sizeof optval ; p++) *p = 0; } #endif /* * Set the shell parameters. */ void setparam(argv) char **argv; { char **newparam; char **ap; int nparam; for (nparam = 0 ; argv[nparam] ; nparam++); ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); while (*argv) { *ap++ = savestr(*argv++); } *ap = NULL; freeparam(&shellparam); shellparam.malloc = 1; shellparam.nparam = nparam; shellparam.p = newparam; shellparam.optnext = NULL; } /* * Free the list of positional parameters. */ void freeparam(param) struct shparam *param; { char **ap; if (param->malloc) { for (ap = param->p ; *ap ; ap++) ckfree(*ap); ckfree(param->p); } } /* * The shift builtin command. */ shiftcmd(argc, argv) char **argv; { int n; char **ap1, **ap2; n = 1; if (argc > 1) n = number(argv[1]); if (n > shellparam.nparam) n = shellparam.nparam; INTOFF; shellparam.nparam -= n; for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { if (shellparam.malloc) ckfree(*ap1); } ap2 = shellparam.p; while ((*ap2++ = *ap1++) != NULL); shellparam.optnext = NULL; INTON; return 0; } /* * The set command builtin. */ setcmd(argc, argv) char **argv; { if (argc == 1) return showvarscmd(argc, argv); INTOFF; options(0); setinteractive(iflag); setjobctl(jflag); if (*argptr != NULL) { setparam(argptr); } INTON; return 0; } /* * The getopts builtin. Shellparam.optnext points to the next argument * to be processed. Shellparam.optptr points to the next character to * be processed in the current argument. If shellparam.optnext is NULL, * then it's the first time getopts has been called. */ getoptscmd(argc, argv) char **argv; { register char *p, *q; char c; char s[10]; if (argc != 3) error("Usage: getopts optstring var"); if (shellparam.optnext == NULL) { shellparam.optnext = shellparam.p; shellparam.optptr = NULL; } if ((p = shellparam.optptr) == NULL || *p == '\0') { p = *shellparam.optnext; if (p == NULL || *p != '-' || *++p == '\0') { atend: fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1); setvar("OPTIND", s, 0); shellparam.optnext = NULL; return 1; } shellparam.optnext++; if (p[0] == '-' && p[1] == '\0') /* check for "--" */ goto atend; } c = *p++; for (q = argv[1] ; *q != c ; ) { if (*q == '\0') { out1fmt("Illegal option -%c\n", c); c = '?'; goto out; } if (*++q == ':') q++; } if (*++q == ':') { if (*p == '\0' && (p = *shellparam.optnext) == NULL) { out1fmt("No arg for -%c option\n", c); c = '?'; goto out; } shellparam.optnext++; setvar("OPTARG", p, 0); p = NULL; } out: shellparam.optptr = p; s[0] = c; s[1] = '\0'; setvar(argv[2], s, 0); return 0; } /* * Standard option processing (a la getopt) for builtin routines. The * only argument that is passed to nextopt is the option string; the * other arguments are unnecessary. It return the character, or '\0' on * end of input. */ int nextopt(optstring) char *optstring; { register char *p, *q; char c; if ((p = optptr) == NULL || *p == '\0') { p = *argptr; if (p == NULL || *p != '-' || *++p == '\0') return '\0'; argptr++; if (p[0] == '-' && p[1] == '\0') /* check for "--" */ return '\0'; } c = *p++; for (q = optstring ; *q != c ; ) { if (*q == '\0') error("Illegal option -%c", c); if (*++q == ':') q++; } if (*++q == ':') { if (*p == '\0' && (p = *argptr++) == NULL) error("No arg for -%c option", c); optarg = p; p = NULL; } optptr = p; return c; }