/* $OpenBSD: io.c,v 1.19 2016/03/22 17:58:28 mmcc Exp $ */ /* $NetBSD: io.c,v 1.2 1995/03/21 09:04:43 cgd Exp $ */ /* io.c: This file contains the i/o 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. */ #include #include #include #include #include #include "ed.h" static int read_stream(FILE *, int); static int get_stream_line(FILE *); static int write_stream(FILE *, int, int); static int put_stream_line(FILE *, char *, int); extern int scripted; /* read_file: read a named file/pipe into the buffer; return line count */ int read_file(char *fn, int n) { FILE *fp; int size; fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r"); if (fp == NULL) { perror(fn); seterrmsg("cannot open input file"); return ERR; } else if ((size = read_stream(fp, n)) < 0) return ERR; else if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) { perror(fn); seterrmsg("cannot close input file"); return ERR; } fprintf(stderr, !scripted ? "%d\n" : "", size); return current_addr - n; } static char *sbuf; /* file i/o buffer */ static int sbufsz; /* file i/o buffer size */ int newline_added; /* if set, newline appended to input file */ /* read_stream: read a stream into the editor buffer; return status */ static int read_stream(FILE *fp, int n) { line_t *lp = get_addressed_line_node(n); undo_t *up = NULL; unsigned int size = 0; int o_newline_added = newline_added; int o_isbinary = isbinary; int appended = (n == addr_last); int len; isbinary = newline_added = 0; for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) { SPL1(); if (put_sbuf_line(sbuf) == NULL) { SPL0(); return ERR; } lp = lp->q_forw; if (up) up->t = lp; else if ((up = push_undo_stack(UADD, current_addr, current_addr)) == NULL) { SPL0(); return ERR; } SPL0(); } if (len < 0) return ERR; if (appended && size && o_isbinary && o_newline_added) fputs("newline inserted\n", stderr); else if (newline_added && (!appended || (!isbinary && !o_isbinary))) fputs("newline appended\n", stderr); if (isbinary && newline_added && !appended) size += 1; if (!size) newline_added = 1; newline_added = appended ? newline_added : o_newline_added; isbinary = isbinary | o_isbinary; return size; } /* get_stream_line: read a line of text from a stream; return line length */ static int get_stream_line(FILE *fp) { int c; int i = 0; while (((c = getc(fp)) != EOF || (!feof(fp) && !ferror(fp))) && c != '\n') { REALLOC(sbuf, sbufsz, i + 1, ERR); if (!(sbuf[i++] = c)) isbinary = 1; } REALLOC(sbuf, sbufsz, i + 2, ERR); if (c == '\n') sbuf[i++] = c; else if (ferror(fp)) { perror(NULL); seterrmsg("cannot read input file"); return ERR; } else if (i) { sbuf[i++] = '\n'; newline_added = 1; } sbuf[i] = '\0'; return (isbinary && newline_added && i) ? --i : i; } /* write_file: write a range of lines to a named file/pipe; return line count */ int write_file(char *fn, char *mode, int n, int m) { FILE *fp; int size; fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode); if (fp == NULL) { perror(fn); seterrmsg("cannot open output file"); return ERR; } else if ((size = write_stream(fp, n, m)) < 0) return ERR; else if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) { perror(fn); seterrmsg("cannot close output file"); return ERR; } fprintf(stderr, !scripted ? "%d\n" : "", size); return n ? m - n + 1 : 0; } /* write_stream: write a range of lines to a stream; return status */ static int write_stream(FILE *fp, int n, int m) { line_t *lp = get_addressed_line_node(n); unsigned int size = 0; char *s; int len; for (; n && n <= m; n++, lp = lp->q_forw) { if ((s = get_sbuf_line(lp)) == NULL) return ERR; len = lp->len; if (n != addr_last || !isbinary || !newline_added) s[len++] = '\n'; if (put_stream_line(fp, s, len) < 0) return ERR; size += len; } return size; } /* put_stream_line: write a line of text to a stream; return status */ static int put_stream_line(FILE *fp, char *s, int len) { while (len--) { if (fputc(*s, fp) < 0) { perror(NULL); seterrmsg("cannot write file"); return ERR; } s++; } return 0; } /* get_extended_line: get a an extended line from stdin */ char * get_extended_line(int *sizep, int nonl) { static char *cvbuf = NULL; /* buffer */ static int cvbufsz = 0; /* buffer size */ int l, n; char *t = ibufp; while (*t++ != '\n') ; if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) { *sizep = l; return ibufp; } *sizep = -1; REALLOC(cvbuf, cvbufsz, l, NULL); memcpy(cvbuf, ibufp, l); *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */ if (nonl) l--; /* strip newline */ for (;;) { if ((n = get_tty_line()) < 0) return NULL; else if (n == 0 || ibuf[n - 1] != '\n') { seterrmsg("unexpected end-of-file"); return NULL; } REALLOC(cvbuf, cvbufsz, l + n, NULL); memcpy(cvbuf + l, ibuf, n); l += n; if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1)) break; *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */ if (nonl) l--; /* strip newline */ } REALLOC(cvbuf, cvbufsz, l + 1, NULL); cvbuf[l] = '\0'; *sizep = l; return cvbuf; } /* get_tty_line: read a line of text from stdin; return line length */ int get_tty_line(void) { int oi = 0; int i = 0; int c; for (;;) switch (c = getchar()) { default: oi = 0; REALLOC(ibuf, ibufsz, i + 2, ERR); if (!(ibuf[i++] = c)) isbinary = 1; if (c != '\n') continue; lineno++; ibuf[i] = '\0'; ibufp = ibuf; return i; case EOF: if (ferror(stdin)) { perror("stdin"); seterrmsg("cannot read stdin"); clearerr(stdin); ibufp = NULL; return ERR; } else { clearerr(stdin); if (i != oi) { oi = i; continue; } else if (i) ibuf[i] = '\0'; ibufp = ibuf; return i; } } } #define ESCAPES "\a\b\f\n\r\t\v\\" #define ESCCHARS "abfnrtv\\" extern int rows; extern int cols; /* put_tty_line: print text to stdout */ int put_tty_line(char *s, int l, int n, int gflag) { int col = 0; #ifndef BACKWARDS int lc = 0; #endif char *cp; if (gflag & GNP) { printf("%d\t", n); col = 8; } for (; l--; s++) { if ((gflag & GLS) && ++col > cols) { fputs("\\\n", stdout); col = 1; #ifndef BACKWARDS if (!scripted && !isglobal && ++lc > rows) { lc = 0; fputs("Press to continue... ", stdout); fflush(stdout); if (get_tty_line() < 0) return ERR; } #endif } if (gflag & GLS) { if (31 < *s && *s < 127 && *s != '\\') putchar(*s); else { putchar('\\'); col++; if (*s && (cp = strchr(ESCAPES, *s)) != NULL) putchar(ESCCHARS[cp - ESCAPES]); else { putchar((((unsigned char) *s & 0300) >> 6) + '0'); putchar((((unsigned char) *s & 070) >> 3) + '0'); putchar(((unsigned char) *s & 07) + '0'); col += 2; } } } else putchar(*s); } #ifndef BACKWARDS if (gflag & GLS) putchar('$'); #endif putchar('\n'); return 0; }