/* $OpenBSD: main.c,v 1.40 2014/07/12 02:47:51 guenther Exp $ */ /* $NetBSD: main.c,v 1.3 1995/03/21 09:04:44 cgd Exp $ */ /* main.c: This file contains the main control and user-interface routines for the ed line editor. */ /*- * Copyright (c) 1993 Andrew Moore, Talke Studio. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * CREDITS * * This program is based on the editor algorithm described in * Brian W. Kernighan and P. J. Plauger's book "Software Tools * in Pascal," Addison-Wesley, 1981. * * The buffering algorithm is attributed to Rodney Ruddock of * the University of Guelph, Guelph, Ontario. * */ #include #include #include #include #include #include #include #include "ed.h" #ifdef _POSIX_SOURCE sigjmp_buf env; #else jmp_buf env; #endif /* static buffers */ char stdinbuf[1]; /* stdin buffer */ char *shcmd; /* shell command buffer */ int shcmdsz; /* shell command buffer size */ int shcmdi; /* shell command buffer index */ char *ibuf; /* ed command-line buffer */ int ibufsz; /* ed command-line buffer size */ char *ibufp; /* pointer to ed command-line buffer */ /* global flags */ int garrulous = 0; /* if set, print all error messages */ int isbinary; /* if set, buffer contains ASCII NULs */ int isglobal; /* if set, doing a global command */ int modified; /* if set, buffer modified since last write */ int mutex = 0; /* if set, signals set "sigflags" */ int scripted = 0; /* if set, suppress diagnostics */ int sigflags = 0; /* if set, signals received while mutex set */ int interactive = 0; /* if set, we are in interactive mode */ /* if set, signal handlers are enabled */ volatile sig_atomic_t sigactive = 0; char old_filename[MAXPATHLEN] = ""; /* default filename */ int current_addr; /* current address in editor buffer */ int addr_last; /* last address in editor buffer */ int lineno; /* script line number */ char *prompt; /* command-line prompt */ char *dps = "*"; /* default command-line prompt */ const char usage[] = "usage: %s [-] [-s] [-p string] [file]\n"; char *home; /* home directory */ void seterrmsg(char *s) { strlcpy(errmsg, s, sizeof(errmsg)); } /* ed: line editor */ int main(volatile int argc, char ** volatile argv) { int c, n; int status = 0; home = getenv("HOME"); top: while ((c = getopt(argc, argv, "p:sx")) != -1) switch (c) { case 'p': /* set prompt */ prompt = optarg; break; case 's': /* run script */ scripted = 1; break; case 'x': /* use crypt */ fprintf(stderr, "crypt unavailable\n?\n"); break; default: fprintf(stderr, usage, argv[0]); exit(1); } argv += optind; argc -= optind; if (argc && **argv == '-') { scripted = 1; if (argc > 1) { optind = 1; goto top; } argv++; argc--; } if (!(interactive = isatty(0))) { struct stat sb; /* assert: pipes show up as fifo's when fstat'd */ if (fstat(STDIN_FILENO, &sb) || !S_ISFIFO(sb.st_mode)) { if (lseek(STDIN_FILENO, 0, SEEK_CUR)) { interactive = 1; setlinebuf(stdout); } } } /* assert: reliable signals! */ #ifdef SIGWINCH if (isatty(STDIN_FILENO)) { handle_winch(SIGWINCH); signal(SIGWINCH, handle_winch); } #endif signal(SIGHUP, signal_hup); signal(SIGQUIT, SIG_IGN); signal(SIGINT, signal_int); #ifdef _POSIX_SOURCE if (status = sigsetjmp(env, 1)) #else if ((status = setjmp(env)) != 0) #endif { fputs("\n?\n", stderr); seterrmsg("interrupt"); } else { init_buffers(); sigactive = 1; /* enable signal handlers */ if (argc && **argv) { if (read_file(*argv, 0) < 0 && !interactive) quit(2); else if (**argv != '!') strlcpy(old_filename, *argv, sizeof old_filename); } else if (argc) { fputs("?\n", stderr); if (**argv == '\0') seterrmsg("invalid filename"); if (!interactive) quit(2); } } for (;;) { if (status < 0 && garrulous) fprintf(stderr, "%s\n", errmsg); if (prompt) { fputs(prompt, stdout); fflush(stdout); } if ((n = get_tty_line()) < 0) { status = ERR; continue; } else if (n == 0) { if (modified && !scripted) { fputs("?\n", stderr); seterrmsg("warning: file modified"); if (!interactive) { fprintf(stderr, garrulous ? "script, line %d: %s\n" : "", lineno, errmsg); quit(2); } clearerr(stdin); modified = 0; status = EMOD; continue; } else quit(0); } else if (ibuf[n - 1] != '\n') { /* discard line */ seterrmsg("unexpected end-of-file"); clearerr(stdin); status = ERR; continue; } isglobal = 0; if ((status = extract_addr_range()) >= 0 && (status = exec_command()) >= 0) if (!status || (status && (status = display_lines(current_addr, current_addr, status)) >= 0)) continue; switch (status) { case EOF: quit(0); case EMOD: modified = 0; fputs("?\n", stderr); /* give warning */ seterrmsg("warning: file modified"); if (!interactive) { fprintf(stderr, garrulous ? "script, line %d: %s\n" : "", lineno, errmsg); quit(2); } break; case FATAL: if (!interactive) fprintf(stderr, garrulous ? "script, line %d: %s\n" : "", lineno, errmsg); else fprintf(stderr, garrulous ? "%s\n" : "", errmsg); quit(3); default: fputs("?\n", stderr); if (!interactive) { fprintf(stderr, garrulous ? "script, line %d: %s\n" : "", lineno, errmsg); quit(2); } break; } } /*NOTREACHED*/ } int first_addr, second_addr, addr_cnt; /* extract_addr_range: get line addresses from the command buffer until an illegal address is seen; return status */ int extract_addr_range(void) { int addr; addr_cnt = 0; first_addr = second_addr = current_addr; while ((addr = next_addr()) >= 0) { addr_cnt++; first_addr = second_addr; second_addr = addr; if (*ibufp != ',' && *ibufp != ';') break; else if (*ibufp++ == ';') current_addr = addr; } if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) first_addr = second_addr; return (addr == ERR) ? ERR : 0; } #define SKIP_BLANKS() \ do { \ while (isspace((unsigned char)*ibufp) && *ibufp != '\n') \ ibufp++; \ } while (0) #define MUST_BE_FIRST() \ do { \ if (!first) { \ seterrmsg("invalid address"); \ return ERR; \ } \ } while (0) /* next_addr: return the next line address in the command buffer */ int next_addr(void) { char *hd; int addr = current_addr; int n; int first = 1; int c; SKIP_BLANKS(); for (hd = ibufp;; first = 0) switch ((c = (unsigned char)*ibufp)) { case '+': case '\t': case ' ': case '-': case '^': ibufp++; SKIP_BLANKS(); if (isdigit((unsigned char)*ibufp)) { STRTOI(n, ibufp); addr += (c == '-' || c == '^') ? -n : n; } else if (!isspace(c)) addr += (c == '-' || c == '^') ? -1 : 1; break; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': MUST_BE_FIRST(); STRTOI(addr, ibufp); break; case '.': case '$': MUST_BE_FIRST(); ibufp++; addr = (c == '.') ? current_addr : addr_last; break; case '/': case '?': MUST_BE_FIRST(); if ((addr = get_matching_node_addr( get_compiled_pattern(), c == '/')) < 0) return ERR; else if (c == *ibufp) ibufp++; break; case '\'': MUST_BE_FIRST(); ibufp++; if ((addr = get_marked_node_addr((unsigned char)*ibufp++)) < 0) return ERR; break; case '%': case ',': case ';': if (first) { ibufp++; addr_cnt++; second_addr = (c == ';') ? current_addr : 1; addr = addr_last; break; } /* FALLTHROUGH */ default: if (ibufp == hd) return EOF; else if (addr < 0 || addr_last < addr) { seterrmsg("invalid address"); return ERR; } else return addr; } /* NOTREACHED */ } #ifdef BACKWARDS /* GET_THIRD_ADDR: get a legal address from the command buffer */ #define GET_THIRD_ADDR(addr) \ do { \ int ol1, ol2; \ \ ol1 = first_addr; \ ol2 = second_addr; \ if (extract_addr_range() < 0) \ return ERR; \ else if (addr_cnt == 0) { \ seterrmsg("destination expected"); \ return ERR; \ } else if (second_addr < 0 || addr_last < second_addr) { \ seterrmsg("invalid address"); \ return ERR; \ } \ addr = second_addr; \ first_addr = ol1; \ second_addr = ol2; \ } while (0) #else /* BACKWARDS */ /* GET_THIRD_ADDR: get a legal address from the command buffer */ #define GET_THIRD_ADDR(addr) \ do { \ int ol1, ol2; \ \ ol1 = first_addr; \ ol2 = second_addr; \ if (extract_addr_range() < 0) \ return ERR; \ if (second_addr < 0 || addr_last < second_addr) { \ seterrmsg("invalid address"); \ return ERR; \ } \ addr = second_addr; \ first_addr = ol1; \ second_addr = ol2; \ } while (0) #endif /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ #define GET_COMMAND_SUFFIX() \ do { \ int done = 0; \ do { \ switch (*ibufp) { \ case 'p': \ gflag |= GPR; \ ibufp++; \ break; \ case 'l': \ gflag |= GLS; \ ibufp++; \ break; \ case 'n': \ gflag |= GNP; \ ibufp++; \ break; \ default: \ done++; \ } \ } while (!done); \ if (*ibufp++ != '\n') { \ seterrmsg("invalid command suffix"); \ return ERR; \ } \ } while (0) /* sflags */ #define SGG 001 /* complement previous global substitute suffix */ #define SGP 002 /* complement previous print suffix */ #define SGR 004 /* use last regex instead of last pat */ #define SGF 010 /* repeat last substitution */ int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ volatile sig_atomic_t rows = 22; /* scroll length: ws_row - 2 */ volatile sig_atomic_t cols = 72; /* wrap column */ /* exec_command: execute the next command in command buffer; return print request, if any */ int exec_command(void) { extern int u_current_addr; extern int u_addr_last; static pattern_t *pat = NULL; static int sgflag = 0; static int sgnum = 0; pattern_t *tpat; char *fnp; int gflag = 0; int sflags = 0; int addr = 0; int n = 0; int c; SKIP_BLANKS(); switch ((c = (unsigned char)*ibufp++)) { case 'a': GET_COMMAND_SUFFIX(); if (!isglobal) clear_undo_stack(); if (append_lines(second_addr) < 0) return ERR; break; case 'c': if (check_addr_range(current_addr, current_addr) < 0) return ERR; GET_COMMAND_SUFFIX(); if (!isglobal) clear_undo_stack(); if (delete_lines(first_addr, second_addr) < 0 || append_lines(current_addr) < 0) return ERR; break; case 'd': if (check_addr_range(current_addr, current_addr) < 0) return ERR; GET_COMMAND_SUFFIX(); if (!isglobal) clear_undo_stack(); if (delete_lines(first_addr, second_addr) < 0) return ERR; else if ((addr = INC_MOD(current_addr, addr_last)) != 0) current_addr = addr; break; case 'e': if (modified && !scripted) return EMOD; /* FALLTHROUGH */ case 'E': if (addr_cnt > 0) { seterrmsg("unexpected address"); return ERR; } else if (!isspace((unsigned char)*ibufp)) { seterrmsg("unexpected command suffix"); return ERR; } else if ((fnp = get_filename()) == NULL) return ERR; GET_COMMAND_SUFFIX(); if (delete_lines(1, addr_last) < 0) return ERR; clear_undo_stack(); if (close_sbuf() < 0) return ERR; else if (open_sbuf() < 0) return FATAL; if (*fnp && *fnp != '!') strlcpy(old_filename, fnp, sizeof old_filename); #ifdef BACKWARDS if (*fnp == '\0' && *old_filename == '\0') { seterrmsg("no current filename"); return ERR; } #endif if (read_file(*fnp ? fnp : old_filename, 0) < 0) return ERR; clear_undo_stack(); modified = 0; u_current_addr = u_addr_last = -1; break; case 'f': if (addr_cnt > 0) { seterrmsg("unexpected address"); return ERR; } else if (!isspace((unsigned char)*ibufp)) { seterrmsg("unexpected command suffix"); return ERR; } else if ((fnp = get_filename()) == NULL) return ERR; else if (*fnp == '!') { seterrmsg("invalid redirection"); return ERR; } GET_COMMAND_SUFFIX(); if (*fnp) strlcpy(old_filename, fnp, sizeof old_filename); puts(strip_escapes(old_filename)); break; case 'g': case 'v': case 'G': case 'V': if (isglobal) { seterrmsg("cannot nest global commands"); return ERR; } else if (check_addr_range(1, addr_last) < 0) return ERR; else if (build_active_list(c == 'g' || c == 'G') < 0) return ERR; else if ((n = (c == 'G' || c == 'V'))) GET_COMMAND_SUFFIX(); isglobal++; if (exec_global(n, gflag) < 0) return ERR; break; case 'h': if (addr_cnt > 0) { seterrmsg("unexpected address"); return ERR; } GET_COMMAND_SUFFIX(); if (*errmsg) fprintf(stderr, "%s\n", errmsg); break; case 'H': if (addr_cnt > 0) { seterrmsg("unexpected address"); return ERR; } GET_COMMAND_SUFFIX(); if ((garrulous = 1 - garrulous) && *errmsg) fprintf(stderr, "%s\n", errmsg); break; case 'i': if (second_addr == 0) { seterrmsg("invalid address"); return ERR; } GET_COMMAND_SUFFIX(); if (!isglobal) clear_undo_stack(); if (append_lines(second_addr - 1) < 0) return ERR; break; case 'j': if (check_addr_range(current_addr, current_addr + 1) < 0) return ERR; GET_COMMAND_SUFFIX(); if (!isglobal) clear_undo_stack(); if (first_addr != second_addr && join_lines(first_addr, second_addr) < 0) return ERR; break; case 'k': c = (unsigned char)*ibufp++; if (second_addr == 0) { seterrmsg("invalid address"); return ERR; } GET_COMMAND_SUFFIX(); if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) return ERR; break; case 'l': if (check_addr_range(current_addr, current_addr) < 0) return ERR; GET_COMMAND_SUFFIX(); if (display_lines(first_addr, second_addr, gflag | GLS) < 0) return ERR; gflag = 0; break; case 'm': if (check_addr_range(current_addr, current_addr) < 0) return ERR; GET_THIRD_ADDR(addr); if (first_addr <= addr && addr < second_addr) { seterrmsg("invalid destination"); return ERR; } GET_COMMAND_SUFFIX(); if (!isglobal) clear_undo_stack(); if (move_lines(addr) < 0) return ERR; break; case 'n': if (check_addr_range(current_addr, current_addr) < 0) return ERR; GET_COMMAND_SUFFIX(); if (display_lines(first_addr, second_addr, gflag | GNP) < 0) return ERR; gflag = 0; break; case 'p': if (check_addr_range(current_addr, current_addr) < 0) return ERR; GET_COMMAND_SUFFIX(); if (display_lines(first_addr, second_addr, gflag | GPR) < 0) return ERR; gflag = 0; break; case 'P': if (addr_cnt > 0) { seterrmsg("unexpected address"); return ERR; } GET_COMMAND_SUFFIX(); prompt = prompt ? NULL : optarg ? optarg : dps; break; case 'q': case 'Q': if (addr_cnt > 0) { seterrmsg("unexpected address"); return ERR; } GET_COMMAND_SUFFIX(); gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; break; case 'r': if (!isspace((unsigned char)*ibufp)) { seterrmsg("unexpected command suffix"); return ERR; } else if (addr_cnt == 0) second_addr = addr_last; if ((fnp = get_filename()) == NULL) return ERR; GET_COMMAND_SUFFIX(); if (!isglobal) clear_undo_stack(); if (*old_filename == '\0' && *fnp != '!') strlcpy(old_filename, fnp, sizeof old_filename); #ifdef BACKWARDS if (*fnp == '\0' && *old_filename == '\0') { seterrmsg("no current filename"); return ERR; } #endif if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) return ERR; else if (addr && addr != addr_last) modified = 1; break; case 's': do { switch (*ibufp) { case '\n': sflags |=SGF; break; case 'g': sflags |= SGG; ibufp++; break; case 'p': sflags |= SGP; ibufp++; break; case 'r': sflags |= SGR; ibufp++; break; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': STRTOI(sgnum, ibufp); sflags |= SGF; sgflag &= ~GSG; /* override GSG */ break; default: if (sflags) { seterrmsg("invalid command suffix"); return ERR; } } } while (sflags && *ibufp != '\n'); if (sflags && !pat) { seterrmsg("no previous substitution"); return ERR; } else if (sflags & SGG) sgnum = 0; /* override numeric arg */ if (*ibufp != '\n' && *(ibufp + 1) == '\n') { seterrmsg("invalid pattern delimiter"); return ERR; } tpat = pat; SPL1(); if ((!sflags || (sflags & SGR)) && (tpat = get_compiled_pattern()) == NULL) { SPL0(); return ERR; } else if (tpat != pat) { if (pat) { regfree(pat); free(pat); } pat = tpat; patlock = 1; /* reserve pattern */ } SPL0(); if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) return ERR; else if (isglobal) sgflag |= GLB; else sgflag &= ~GLB; if (sflags & SGG) sgflag ^= GSG; if (sflags & SGP) { sgflag ^= GPR; sgflag &= ~(GLS | GNP); } do { switch (*ibufp) { case 'p': sgflag |= GPR; ibufp++; break; case 'l': sgflag |= GLS; ibufp++; break; case 'n': sgflag |= GNP; ibufp++; break; default: n++; } } while (!n); if (check_addr_range(current_addr, current_addr) < 0) return ERR; GET_COMMAND_SUFFIX(); if (!isglobal) clear_undo_stack(); if (search_and_replace(pat, sgflag, sgnum) < 0) return ERR; break; case 't': if (check_addr_range(current_addr, current_addr) < 0) return ERR; GET_THIRD_ADDR(addr); GET_COMMAND_SUFFIX(); if (!isglobal) clear_undo_stack(); if (copy_lines(addr) < 0) return ERR; break; case 'u': if (addr_cnt > 0) { seterrmsg("unexpected address"); return ERR; } GET_COMMAND_SUFFIX(); if (pop_undo_stack() < 0) return ERR; break; case 'w': case 'W': if ((n = *ibufp) == 'q' || n == 'Q') { gflag = EOF; ibufp++; } if (!isspace((unsigned char)*ibufp)) { seterrmsg("unexpected command suffix"); return ERR; } else if ((fnp = get_filename()) == NULL) return ERR; if (addr_cnt == 0 && !addr_last) first_addr = second_addr = 0; else if (check_addr_range(1, addr_last) < 0) return ERR; GET_COMMAND_SUFFIX(); if (*old_filename == '\0' && *fnp != '!') strlcpy(old_filename, fnp, sizeof old_filename); #ifdef BACKWARDS if (*fnp == '\0' && *old_filename == '\0') { seterrmsg("no current filename"); return ERR; } #endif if ((addr = write_file(*fnp ? fnp : old_filename, (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) return ERR; else if (addr == addr_last) modified = 0; else if (modified && !scripted && n == 'q') gflag = EMOD; break; case 'x': if (addr_cnt > 0) { seterrmsg("unexpected address"); return ERR; } GET_COMMAND_SUFFIX(); seterrmsg("crypt unavailable"); return ERR; case 'z': first_addr = 1; #ifdef BACKWARDS if (check_addr_range(first_addr, current_addr + 1) < 0) #else if (check_addr_range(first_addr, current_addr + !isglobal) < 0) #endif return ERR; else if ('0' < *ibufp && *ibufp <= '9') STRTOI(rows, ibufp); GET_COMMAND_SUFFIX(); if (display_lines(second_addr, min(addr_last, second_addr + rows), gflag) < 0) return ERR; gflag = 0; break; case '=': GET_COMMAND_SUFFIX(); printf("%d\n", addr_cnt ? second_addr : addr_last); break; case '!': if (addr_cnt > 0) { seterrmsg("unexpected address"); return ERR; } else if ((sflags = get_shell_command()) < 0) return ERR; GET_COMMAND_SUFFIX(); if (sflags) printf("%s\n", shcmd + 1); system(shcmd + 1); if (!scripted) printf("!\n"); break; case '\n': first_addr = 1; #ifdef BACKWARDS if (check_addr_range(first_addr, current_addr + 1) < 0 #else if (check_addr_range(first_addr, current_addr + !isglobal) < 0 #endif || display_lines(second_addr, second_addr, 0) < 0) return ERR; break; default: seterrmsg("unknown command"); return ERR; } return gflag; } /* check_addr_range: return status of address range check */ int check_addr_range(int n, int m) { if (addr_cnt == 0) { first_addr = n; second_addr = m; } if (first_addr > second_addr || 1 > first_addr || second_addr > addr_last) { seterrmsg("invalid address"); return ERR; } return 0; } /* get_matching_node_addr: return the address of the next line matching a pattern in a given direction. wrap around begin/end of editor buffer if necessary */ int get_matching_node_addr(pattern_t *pat, int dir) { char *s; int n = current_addr; line_t *lp; if (!pat) return ERR; do { if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { lp = get_addressed_line_node(n); if ((s = get_sbuf_line(lp)) == NULL) return ERR; if (isbinary) NUL_TO_NEWLINE(s, lp->len); if (!regexec(pat, s, 0, NULL, 0)) return n; } } while (n != current_addr); seterrmsg("no match"); return ERR; } /* get_filename: return pointer to copy of filename in the command buffer */ char * get_filename(void) { static char *file = NULL; static int filesz = 0; int n; if (*ibufp != '\n') { SKIP_BLANKS(); if (*ibufp == '\n') { seterrmsg("invalid filename"); return NULL; } else if ((ibufp = get_extended_line(&n, 1)) == NULL) return NULL; else if (*ibufp == '!') { ibufp++; if ((n = get_shell_command()) < 0) return NULL; if (n) printf("%s\n", shcmd + 1); return shcmd; } else if (n >= MAXPATHLEN) { seterrmsg("filename too long"); return NULL; } } #ifndef BACKWARDS else if (*old_filename == '\0') { seterrmsg("no current filename"); return NULL; } #endif REALLOC(file, filesz, MAXPATHLEN, NULL); for (n = 0; *ibufp != '\n';) file[n++] = *ibufp++; file[n] = '\0'; return file; } /* get_shell_command: read a shell command from stdin; return substitution status */ int get_shell_command(void) { static char *buf = NULL; static int n = 0; char *s; /* substitution char pointer */ int i = 0; int j = 0; if ((s = ibufp = get_extended_line(&j, 1)) == NULL) return ERR; REALLOC(buf, n, j + 1, ERR); buf[i++] = '!'; /* prefix command w/ bang */ while (*ibufp != '\n') switch (*ibufp) { default: REALLOC(buf, n, i + 2, ERR); buf[i++] = *ibufp; if (*ibufp++ == '\\') buf[i++] = *ibufp++; break; case '!': if (s != ibufp) { REALLOC(buf, n, i + 1, ERR); buf[i++] = *ibufp++; } #ifdef BACKWARDS else if (shcmd == NULL || *(shcmd + 1) == '\0') #else else if (shcmd == NULL) #endif { seterrmsg("no previous command"); return ERR; } else { REALLOC(buf, n, i + shcmdi, ERR); for (s = shcmd + 1; s < shcmd + shcmdi;) buf[i++] = *s++; s = ibufp++; } break; case '%': if (*old_filename == '\0') { seterrmsg("no current filename"); return ERR; } j = strlen(s = strip_escapes(old_filename)); REALLOC(buf, n, i + j, ERR); while (j--) buf[i++] = *s++; s = ibufp++; break; } REALLOC(shcmd, shcmdsz, i + 1, ERR); memcpy(shcmd, buf, i); shcmd[shcmdi = i] = '\0'; return *s == '!' || *s == '%'; } /* append_lines: insert text from stdin to after line n; stop when either a single period is read or EOF; return status */ int append_lines(int n) { int l; char *lp = ibuf; char *eot; undo_t *up = NULL; for (current_addr = n;;) { if (!isglobal) { if ((l = get_tty_line()) < 0) return ERR; else if (l == 0 || ibuf[l - 1] != '\n') { clearerr(stdin); return l ? EOF : 0; } lp = ibuf; } else if (*(lp = ibufp) == '\0') return 0; else { while (*ibufp++ != '\n') ; l = ibufp - lp; } if (l == 2 && lp[0] == '.' && lp[1] == '\n') { return 0; } eot = lp + l; SPL1(); do { if ((lp = put_sbuf_line(lp)) == NULL) { SPL0(); return ERR; } else if (up) up->t = get_addressed_line_node(current_addr); else if ((up = push_undo_stack(UADD, current_addr, current_addr)) == NULL) { SPL0(); return ERR; } } while (lp != eot); modified = 1; SPL0(); } /* NOTREACHED */ } /* join_lines: replace a range of lines with the joined text of those lines */ int join_lines(int from, int to) { static char *buf = NULL; static int n; char *s; int size = 0; line_t *bp, *ep; ep = get_addressed_line_node(INC_MOD(to, addr_last)); bp = get_addressed_line_node(from); for (; bp != ep; bp = bp->q_forw) { if ((s = get_sbuf_line(bp)) == NULL) return ERR; REALLOC(buf, n, size + bp->len, ERR); memcpy(buf + size, s, bp->len); size += bp->len; } REALLOC(buf, n, size + 2, ERR); memcpy(buf + size, "\n", 2); if (delete_lines(from, to) < 0) return ERR; current_addr = from - 1; SPL1(); if (put_sbuf_line(buf) == NULL || push_undo_stack(UADD, current_addr, current_addr) == NULL) { SPL0(); return ERR; } modified = 1; SPL0(); return 0; } /* move_lines: move a range of lines */ int move_lines(int addr) { line_t *b1, *a1, *b2, *a2; int n = INC_MOD(second_addr, addr_last); int p = first_addr - 1; int done = (addr == first_addr - 1 || addr == second_addr); SPL1(); if (done) { a2 = get_addressed_line_node(n); b2 = get_addressed_line_node(p); current_addr = second_addr; } else if (push_undo_stack(UMOV, p, n) == NULL || push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { SPL0(); return ERR; } else { a1 = get_addressed_line_node(n); if (addr < first_addr) { b1 = get_addressed_line_node(p); b2 = get_addressed_line_node(addr); /* this get_addressed_line_node last! */ } else { b2 = get_addressed_line_node(addr); b1 = get_addressed_line_node(p); /* this get_addressed_line_node last! */ } a2 = b2->q_forw; REQUE(b2, b1->q_forw); REQUE(a1->q_back, a2); REQUE(b1, a1); current_addr = addr + ((addr < first_addr) ? second_addr - first_addr + 1 : 0); } if (isglobal) unset_active_nodes(b2->q_forw, a2); modified = 1; SPL0(); return 0; } /* copy_lines: copy a range of lines; return status */ int copy_lines(int addr) { line_t *lp, *np = get_addressed_line_node(first_addr); undo_t *up = NULL; int n = second_addr - first_addr + 1; int m = 0; current_addr = addr; if (first_addr <= addr && addr < second_addr) { n = addr - first_addr + 1; m = second_addr - addr; } for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) for (; n-- > 0; np = np->q_forw) { SPL1(); if ((lp = dup_line_node(np)) == NULL) { SPL0(); return ERR; } add_line_node(lp); if (up) up->t = lp; else if ((up = push_undo_stack(UADD, current_addr, current_addr)) == NULL) { SPL0(); return ERR; } modified = 1; SPL0(); } return 0; } /* delete_lines: delete a range of lines */ int delete_lines(int from, int to) { line_t *n, *p; SPL1(); if (push_undo_stack(UDEL, from, to) == NULL) { SPL0(); return ERR; } n = get_addressed_line_node(INC_MOD(to, addr_last)); p = get_addressed_line_node(from - 1); /* this get_addressed_line_node last! */ if (isglobal) unset_active_nodes(p->q_forw, n); REQUE(p, n); addr_last -= to - from + 1; current_addr = from - 1; modified = 1; SPL0(); return 0; } /* display_lines: print a range of lines to stdout */ int display_lines(int from, int to, int gflag) { line_t *bp; line_t *ep; char *s; if (!from) { seterrmsg("invalid address"); return ERR; } ep = get_addressed_line_node(INC_MOD(to, addr_last)); bp = get_addressed_line_node(from); for (; bp != ep; bp = bp->q_forw) { if ((s = get_sbuf_line(bp)) == NULL) return ERR; if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) return ERR; } return 0; } #define MAXMARK 26 /* max number of marks */ line_t *mark[MAXMARK]; /* line markers */ int markno; /* line marker count */ /* mark_line_node: set a line node mark */ int mark_line_node(line_t *lp, int n) { if (!islower(n)) { seterrmsg("invalid mark character"); return ERR; } else if (mark[n - 'a'] == NULL) markno++; mark[n - 'a'] = lp; return 0; } /* get_marked_node_addr: return address of a marked line */ int get_marked_node_addr(int n) { if (!islower(n)) { seterrmsg("invalid mark character"); return ERR; } return get_line_node_addr(mark[n - 'a']); } /* unmark_line_node: clear line node mark */ void unmark_line_node(line_t *lp) { int i; for (i = 0; markno && i < MAXMARK; i++) if (mark[i] == lp) { mark[i] = NULL; markno--; } } /* dup_line_node: return a pointer to a copy of a line node */ line_t * dup_line_node(line_t *lp) { line_t *np; if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { perror(NULL); seterrmsg("out of memory"); return NULL; } np->seek = lp->seek; np->len = lp->len; return np; } /* has_trailing_escape: return the parity of escapes preceding a character in a string */ int has_trailing_escape(char *s, char *t) { return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); } /* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ char * strip_escapes(char *s) { static char *file = NULL; static int filesz = 0; int i = 0; REALLOC(file, filesz, MAXPATHLEN, NULL); /* assert: no trailing escape */ while ((file[i++] = (*s == '\\') ? *++s : *s) != '\0' && i < MAXPATHLEN-1) s++; file[MAXPATHLEN-1] = '\0'; return file; } void signal_hup(int signo) { int save_errno = errno; if (mutex) sigflags |= (1 << (signo - 1)); else handle_hup(signo); errno = save_errno; } void signal_int(int signo) { int save_errno = errno; if (mutex) sigflags |= (1 << (signo - 1)); else handle_int(signo); errno = save_errno; } void handle_hup(int signo) { char hup[MAXPATHLEN]; if (!sigactive) quit(1); sigflags &= ~(1 << (signo - 1)); /* XXX signal race */ if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && home != NULL && home[0] == '/') { if (strlcpy(hup, home, sizeof(hup)) < sizeof(hup) && strlcat(hup, "/ed.hup", sizeof(hup)) < sizeof(hup)) write_file(hup, "w", 1, addr_last); } _exit(2); } void handle_int(int signo) { if (!sigactive) _exit(1); sigflags &= ~(1 << (signo - 1)); #ifdef _POSIX_SOURCE siglongjmp(env, -1); #else longjmp(env, -1); #endif } void handle_winch(int signo) { int save_errno = errno; struct winsize ws; /* window size structure */ sigflags &= ~(1 << (signo - 1)); if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0) { if (ws.ws_row > 2) rows = ws.ws_row - 2; if (ws.ws_col > 8) cols = ws.ws_col - 8; } errno = save_errno; }