=================================================================== RCS file: /cvs/mandoc/main.c,v retrieving revision 1.156 retrieving revision 1.195 diff -u -p -r1.156 -r1.195 --- mandoc/main.c 2011/03/20 16:05:21 1.156 +++ mandoc/main.c 2014/10/28 17:36:19 1.195 @@ -1,7 +1,8 @@ -/* $Id: main.c,v 1.156 2011/03/20 16:05:21 kristaps Exp $ */ +/* $Id: main.c,v 1.195 2014/10/28 17:36:19 schwarze Exp $ */ /* - * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons - * Copyright (c) 2010, 2011 Ingo Schwarze + * Copyright (c) 2008-2012 Kristaps Dzonsons + * Copyright (c) 2010, 2011, 2012, 2014 Ingo Schwarze + * Copyright (c) 2010 Joerg Sonnenberger * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above @@ -15,11 +16,14 @@ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ -#ifdef HAVE_CONFIG_H #include "config.h" -#endif +#include + #include +#include +#include +#include #include #include #include @@ -27,10 +31,12 @@ #include #include "mandoc.h" +#include "mandoc_aux.h" #include "main.h" #include "mdoc.h" #include "man.h" -#include "roff.h" +#include "manpath.h" +#include "mansearch.h" #if !defined(__GNUC__) || (__GNUC__ < 2) # if !defined(lint) @@ -38,15 +44,26 @@ # endif #endif /* !defined(__GNUC__) || (__GNUC__ < 2) */ +enum outmode { + OUTMODE_DEF = 0, + OUTMODE_FLN, + OUTMODE_LST, + OUTMODE_ALL, + OUTMODE_INT, + OUTMODE_ONE +}; + typedef void (*out_mdoc)(void *, const struct mdoc *); typedef void (*out_man)(void *, const struct man *); typedef void (*out_free)(void *); enum outt { OUTT_ASCII = 0, /* -Tascii */ + OUTT_LOCALE, /* -Tlocale */ + OUTT_UTF8, /* -Tutf8 */ OUTT_TREE, /* -Ttree */ + OUTT_MAN, /* -Tman */ OUTT_HTML, /* -Thtml */ - OUTT_XHTML, /* -Txhtml */ OUTT_LINT, /* -Tlint */ OUTT_PS, /* -Tps */ OUTT_PDF /* -Tpdf */ @@ -54,152 +71,56 @@ enum outt { struct curparse { struct mparse *mp; + struct mchars *mchars; /* character table */ enum mandoclevel wlevel; /* ignore messages below this */ int wstop; /* stop after a file with a warning */ - enum outt outtype; /* which output to use */ + enum outt outtype; /* which output to use */ out_mdoc outmdoc; /* mdoc output ptr */ - out_man outman; /* man output ptr */ + out_man outman; /* man output ptr */ out_free outfree; /* free output ptr */ void *outdata; /* data for output */ char outopts[BUFSIZ]; /* buf of output opts */ }; -static const char * const mandoclevels[MANDOCLEVEL_MAX] = { - "SUCCESS", - "RESERVED", - "WARNING", - "ERROR", - "FATAL", - "BADARG", - "SYSERR" -}; - -static const char * const mandocerrs[MANDOCERR_MAX] = { - "ok", - - "generic warning", - - /* related to the prologue */ - "no title in document", - "document title should be all caps", - "unknown manual section", - "date missing, using today's date", - "cannot parse date, using it verbatim", - "prologue macros out of order", - "duplicate prologue macro", - "macro not allowed in prologue", - "macro not allowed in body", - - /* related to document structure */ - ".so is fragile, better use ln(1)", - "NAME section must come first", - "bad NAME section contents", - "manual name not yet set", - "sections out of conventional order", - "duplicate section name", - "section not in conventional manual section", - - /* related to macros and nesting */ - "skipping obsolete macro", - "skipping paragraph macro", - "skipping no-space macro", - "blocks badly nested", - "child violates parent syntax", - "nested displays are not portable", - "already in literal mode", - - /* related to missing macro arguments */ - "skipping empty macro", - "argument count wrong", - "missing display type", - "list type must come first", - "tag lists require a width argument", - "missing font type", - "skipping end of block that is not open", - - /* related to bad macro arguments */ - "skipping argument", - "duplicate argument", - "duplicate display type", - "duplicate list type", - "unknown AT&T UNIX version", - "bad Boolean value", - "unknown font", - "unknown standard specifier", - "bad width argument", - - /* related to plain text */ - "blank line in non-literal context", - "tab in non-literal context", - "end of line whitespace", - "bad comment style", - "unknown escape sequence", - "unterminated quoted string", - - "generic error", - - /* related to tables */ - "bad table syntax", - "bad table option", - "bad table layout", - "no table layout cells specified", - "no table data cells specified", - "ignore data in cell", - "data block still open", - "ignoring extra data cells", - - "input stack limit exceeded, infinite loop?", - "skipping bad character", - "escaped character not allowed in a name", - "skipping text before the first section header", - "skipping unknown macro", - "NOT IMPLEMENTED, please use groff: skipping request", - "line scope broken", - "argument count wrong", - "skipping end of block that is not open", - "missing end of block", - "scope open on exit", - "uname(3) system call failed", - "macro requires line argument(s)", - "macro requires body argument(s)", - "macro requires argument(s)", - "missing list type", - "line argument(s) will be lost", - "body argument(s) will be lost", - - "generic fatal error", - - "column syntax is inconsistent", - "NOT IMPLEMENTED: .Bd -file", - "line scope broken, syntax violated", - "argument count wrong, violates syntax", - "child violates parent syntax", - "argument count wrong, violates syntax", - "NOT IMPLEMENTED: .so with absolute path or \"..\"", - "no document body", - "no document prologue", - "static buffer exhausted", -}; - -static int moptions(enum mparset *, char *); +static int koptions(int *, char *); +static int moptions(int *, char *); static void mmsg(enum mandocerr, enum mandoclevel, const char *, int, int, const char *); -static void parse(struct curparse *, int, +static void parse(struct curparse *, int, const char *, enum mandoclevel *); +static enum mandoclevel passthrough(const char *, int); +static void spawn_pager(void); static int toptions(struct curparse *, char *); -static void usage(void) __attribute__((noreturn)); +static void usage(enum argmode) __attribute__((noreturn)); static void version(void) __attribute__((noreturn)); static int woptions(struct curparse *, char *); +static const int sec_prios[] = {1, 4, 5, 8, 6, 3, 7, 2, 9}; static const char *progname; + int main(int argc, char *argv[]) { - int c; struct curparse curp; - enum mparset type; + struct mansearch search; + struct manpaths paths; + char *conf_file, *defpaths, *auxpaths; + char *defos; +#if HAVE_SQLITE3 + struct manpage *res, *resp; + size_t isec, i, sz; + int prio, best_prio; + char sec; +#endif enum mandoclevel rc; + enum outmode outmode; + pid_t child_pid; + int fd; + int show_usage; + int use_pager; + int options; + int c; progname = strrchr(argv[0], '/'); if (progname == NULL) @@ -207,61 +128,303 @@ main(int argc, char *argv[]) else ++progname; - memset(&curp, 0, sizeof(struct curparse)); + /* Search options. */ - type = MPARSE_AUTO; + memset(&paths, 0, sizeof(struct manpaths)); + conf_file = defpaths = auxpaths = NULL; + + memset(&search, 0, sizeof(struct mansearch)); + search.outkey = "Nd"; + + if (strcmp(progname, "man") == 0) + search.argmode = ARG_NAME; + else if (strncmp(progname, "apropos", 7) == 0) + search.argmode = ARG_EXPR; + else if (strncmp(progname, "whatis", 6) == 0) + search.argmode = ARG_WORD; + else + search.argmode = ARG_FILE; + + /* Parser and formatter options. */ + + memset(&curp, 0, sizeof(struct curparse)); curp.outtype = OUTT_ASCII; curp.wlevel = MANDOCLEVEL_FATAL; + options = MPARSE_SO | MPARSE_UTF8 | MPARSE_LATIN1; + defos = NULL; - /* LINTED */ - while (-1 != (c = getopt(argc, argv, "m:O:T:VW:"))) + use_pager = 1; + show_usage = 0; + outmode = OUTMODE_DEF; + + while (-1 != (c = getopt(argc, argv, + "aC:cfhI:iK:klM:m:O:S:s:T:VW:w"))) { switch (c) { - case ('m'): - if ( ! moptions(&type, optarg)) + case 'a': + outmode = OUTMODE_ALL; + break; + case 'C': + conf_file = optarg; + break; + case 'c': + use_pager = 0; + break; + case 'f': + search.argmode = ARG_WORD; + break; + case 'h': + (void)strlcat(curp.outopts, "synopsis,", BUFSIZ); + outmode = OUTMODE_ALL; + break; + case 'I': + if (strncmp(optarg, "os=", 3)) { + fprintf(stderr, + "%s: -I%s: Bad argument\n", + progname, optarg); return((int)MANDOCLEVEL_BADARG); + } + if (defos) { + fprintf(stderr, + "%s: -I%s: Duplicate argument\n", + progname, optarg); + return((int)MANDOCLEVEL_BADARG); + } + defos = mandoc_strdup(optarg + 3); break; - case ('O'): + case 'i': + outmode = OUTMODE_INT; + break; + case 'K': + if ( ! koptions(&options, optarg)) + return((int)MANDOCLEVEL_BADARG); + break; + case 'k': + search.argmode = ARG_EXPR; + break; + case 'l': + search.argmode = ARG_FILE; + outmode = OUTMODE_ALL; + break; + case 'M': + defpaths = optarg; + break; + case 'm': + auxpaths = optarg; + break; + case 'O': + search.outkey = optarg; (void)strlcat(curp.outopts, optarg, BUFSIZ); (void)strlcat(curp.outopts, ",", BUFSIZ); break; - case ('T'): + case 'S': + search.arch = optarg; + break; + case 's': + search.sec = optarg; + break; + case 'T': if ( ! toptions(&curp, optarg)) return((int)MANDOCLEVEL_BADARG); break; - case ('W'): + case 'W': if ( ! woptions(&curp, optarg)) return((int)MANDOCLEVEL_BADARG); break; - case ('V'): + case 'w': + outmode = OUTMODE_FLN; + break; + case 'V': version(); /* NOTREACHED */ default: - usage(); - /* NOTREACHED */ + show_usage = 1; + break; } + } - curp.mp = mparse_alloc(type, curp.wlevel, mmsg, &curp); + if (show_usage) + usage(search.argmode); + /* Postprocess options. */ + + if (outmode == OUTMODE_DEF) { + switch (search.argmode) { + case ARG_FILE: + outmode = OUTMODE_ALL; + use_pager = 0; + break; + case ARG_NAME: + outmode = OUTMODE_ONE; + break; + default: + outmode = OUTMODE_LST; + break; + } + } + + /* Parse arguments. */ + argc -= optind; argv += optind; +#if HAVE_SQLITE3 + resp = NULL; +#endif + /* Quirk for a man(1) section argument without -s. */ + + if (search.argmode == ARG_NAME && + argv[0] != NULL && + isdigit((unsigned char)argv[0][0]) && + (argv[0][1] == '\0' || !strcmp(argv[0], "3p"))) { + search.sec = argv[0]; + argv++; + argc--; + } + rc = MANDOCLEVEL_OK; - if (NULL == *argv) + /* man(1), whatis(1), apropos(1) */ + + if (search.argmode != ARG_FILE) { +#if HAVE_SQLITE3 + if (argc == 0) + usage(search.argmode); + + /* Access the mandoc database. */ + + manpath_parse(&paths, conf_file, defpaths, auxpaths); + mansearch_setup(1); + if( ! mansearch(&search, &paths, argc, argv, &res, &sz)) + usage(search.argmode); + resp = res; + + if (sz == 0) { + if (search.argmode == ARG_NAME) + fprintf(stderr, "%s: No entry for %s " + "in the manual.\n", progname, argv[0]); + rc = MANDOCLEVEL_BADARG; + goto out; + } + + /* + * For standard man(1) and -a output mode, + * prepare for copying filename pointers + * into the program parameter array. + */ + + if (outmode == OUTMODE_ONE) { + argc = 1; + best_prio = 10; + } else if (outmode == OUTMODE_ALL) + argc = (int)sz; + + /* Iterate all matching manuals. */ + + for (i = 0; i < sz; i++) { + if (outmode == OUTMODE_FLN) + puts(res[i].file); + else if (outmode == OUTMODE_LST) + printf("%s - %s\n", res[i].names, + res[i].output == NULL ? "" : + res[i].output); + else if (outmode == OUTMODE_ONE) { + /* Search for the best section. */ + isec = strcspn(res[i].file, "123456789"); + sec = res[i].file[isec]; + if ('\0' == sec) + continue; + prio = sec_prios[sec - '1']; + if (prio >= best_prio) + continue; + best_prio = prio; + resp = res + i; + } + } + + /* + * For man(1), -a and -i output mode, fall through + * to the main mandoc(1) code iterating files + * and running the parsers on each of them. + */ + + if (outmode == OUTMODE_FLN || outmode == OUTMODE_LST) + goto out; +#else + fputs("mandoc: database support not compiled in\n", + stderr); + return((int)MANDOCLEVEL_BADARG); +#endif + } + + /* mandoc(1) */ + + if ( ! moptions(&options, auxpaths)) + return((int)MANDOCLEVEL_BADARG); + + if (use_pager && isatty(STDOUT_FILENO)) + spawn_pager(); + + curp.mchars = mchars_alloc(); + curp.mp = mparse_alloc(options, curp.wlevel, mmsg, + curp.mchars, defos); + + /* + * Conditionally start up the lookaside buffer before parsing. + */ + if (OUTT_MAN == curp.outtype) + mparse_keep(curp.mp); + + if (argc == 0) parse(&curp, STDIN_FILENO, "", &rc); - while (*argv) { - parse(&curp, -1, *argv, &rc); + while (argc) { +#if HAVE_SQLITE3 + if (resp != NULL) { + rc = mparse_open(curp.mp, &fd, resp->file, + &child_pid); + if (fd == -1) + /* nothing */; + else if (resp->form & FORM_SRC) { + /* For .so only; ignore failure. */ + chdir(paths.paths[resp->ipath]); + parse(&curp, fd, resp->file, &rc); + } else + rc = passthrough(resp->file, fd); + resp++; + } else +#endif + { + rc = mparse_open(curp.mp, &fd, *argv++, + &child_pid); + if (fd != -1) + parse(&curp, fd, argv[-1], &rc); + } + + if (child_pid && + mparse_wait(curp.mp, child_pid) != MANDOCLEVEL_OK) + rc = MANDOCLEVEL_SYSERR; + if (MANDOCLEVEL_OK != rc && curp.wstop) break; - ++argv; + argc--; } if (curp.outfree) (*curp.outfree)(curp.outdata); - if (curp.mp) - mparse_free(curp.mp); + mparse_free(curp.mp); + mchars_free(curp.mchars); +#if HAVE_SQLITE3 +out: + if (search.argmode != ARG_FILE) { + manpath_free(&paths); + mansearch_free(res, sz); + mansearch_setup(0); + } +#endif + + free(defos); + return((int)rc); } @@ -269,30 +432,42 @@ static void version(void) { - printf("%s %s\n", progname, VERSION); + printf("mandoc %s\n", VERSION); exit((int)MANDOCLEVEL_OK); } static void -usage(void) +usage(enum argmode argmode) { - fprintf(stderr, "usage: %s " - "[-V] " - "[-foption] " - "[-mformat] " - "[-Ooption] " - "[-Toutput] " - "[-Werr] " - "[file...]\n", - progname); - + switch (argmode) { + case ARG_FILE: + fputs("usage: mandoc [-acfhklV] [-Ios=name] " + "[-mformat] [-Ooption] [-Toutput] [-Wlevel]\n" + "\t [file ...]\n", stderr); + break; + case ARG_NAME: + fputs("usage: man [-acfhklVw] [-C file] " + "[-M path] [-m path] [-S arch] [-s section]\n" + "\t [section] name ...\n", stderr); + break; + case ARG_WORD: + fputs("usage: whatis [-acfhklVw] [-C file] " + "[-M path] [-m path] [-O outkey] [-S arch]\n" + "\t [-s section] name ...\n", stderr); + break; + case ARG_EXPR: + fputs("usage: apropos [-acfhklVw] [-C file] " + "[-M path] [-m path] [-O outkey] [-S arch]\n" + "\t [-s section] expression ...\n", stderr); + break; + } exit((int)MANDOCLEVEL_BADARG); } static void -parse(struct curparse *curp, int fd, - const char *file, enum mandoclevel *level) +parse(struct curparse *curp, int fd, const char *file, + enum mandoclevel *level) { enum mandoclevel rc; struct mdoc *mdoc; @@ -322,22 +497,34 @@ parse(struct curparse *curp, int fd, if ( ! (curp->outman && curp->outmdoc)) { switch (curp->outtype) { - case (OUTT_XHTML): - curp->outdata = xhtml_alloc(curp->outopts); + case OUTT_HTML: + curp->outdata = html_alloc(curp->mchars, + curp->outopts); + curp->outfree = html_free; break; - case (OUTT_HTML): - curp->outdata = html_alloc(curp->outopts); + case OUTT_UTF8: + curp->outdata = utf8_alloc(curp->mchars, + curp->outopts); + curp->outfree = ascii_free; break; - case (OUTT_ASCII): - curp->outdata = ascii_alloc(curp->outopts); + case OUTT_LOCALE: + curp->outdata = locale_alloc(curp->mchars, + curp->outopts); curp->outfree = ascii_free; break; - case (OUTT_PDF): - curp->outdata = pdf_alloc(curp->outopts); + case OUTT_ASCII: + curp->outdata = ascii_alloc(curp->mchars, + curp->outopts); + curp->outfree = ascii_free; + break; + case OUTT_PDF: + curp->outdata = pdf_alloc(curp->mchars, + curp->outopts); curp->outfree = pspdf_free; break; - case (OUTT_PS): - curp->outdata = ps_alloc(curp->outopts); + case OUTT_PS: + curp->outdata = ps_alloc(curp->mchars, + curp->outopts); curp->outfree = pspdf_free; break; default: @@ -345,22 +532,27 @@ parse(struct curparse *curp, int fd, } switch (curp->outtype) { - case (OUTT_HTML): - /* FALLTHROUGH */ - case (OUTT_XHTML): + case OUTT_HTML: curp->outman = html_man; curp->outmdoc = html_mdoc; - curp->outfree = html_free; break; - case (OUTT_TREE): + case OUTT_TREE: curp->outman = tree_man; curp->outmdoc = tree_mdoc; break; - case (OUTT_PDF): + case OUTT_MAN: + curp->outmdoc = man_mdoc; + curp->outman = man_man; + break; + case OUTT_PDF: /* FALLTHROUGH */ - case (OUTT_ASCII): + case OUTT_ASCII: /* FALLTHROUGH */ - case (OUTT_PS): + case OUTT_UTF8: + /* FALLTHROUGH */ + case OUTT_LOCALE: + /* FALLTHROUGH */ + case OUTT_PS: curp->outman = terminal_man; curp->outmdoc = terminal_mdoc; break; @@ -369,7 +561,7 @@ parse(struct curparse *curp, int fd, } } - mparse_result(curp->mp, &mdoc, &man); + mparse_result(curp->mp, &mdoc, &man, NULL); /* Execute the out device, if it exists. */ @@ -386,18 +578,69 @@ parse(struct curparse *curp, int fd, *level = rc; } +static enum mandoclevel +passthrough(const char *file, int fd) +{ + char buf[BUFSIZ]; + const char *syscall; + ssize_t nr, nw, off; + + while ((nr = read(fd, buf, BUFSIZ)) != -1 && nr != 0) + for (off = 0; off < nr; off += nw) + if ((nw = write(STDOUT_FILENO, buf + off, + (size_t)(nr - off))) == -1 || nw == 0) { + close(fd); + syscall = "write"; + goto fail; + } + + close(fd); + + if (nr == 0) + return(MANDOCLEVEL_OK); + + syscall = "read"; +fail: + fprintf(stderr, "%s: %s: SYSERR: %s: %s", + progname, file, syscall, strerror(errno)); + return(MANDOCLEVEL_SYSERR); +} + static int -moptions(enum mparset *tflags, char *arg) +koptions(int *options, char *arg) { - if (0 == strcmp(arg, "doc")) - *tflags = MPARSE_MDOC; + if ( ! strcmp(arg, "utf-8")) { + *options |= MPARSE_UTF8; + *options &= ~MPARSE_LATIN1; + } else if ( ! strcmp(arg, "iso-8859-1")) { + *options |= MPARSE_LATIN1; + *options &= ~MPARSE_UTF8; + } else if ( ! strcmp(arg, "us-ascii")) { + *options &= ~(MPARSE_UTF8 | MPARSE_LATIN1); + } else { + fprintf(stderr, "%s: -K%s: Bad argument\n", + progname, arg); + return(0); + } + return(1); +} + +static int +moptions(int *options, char *arg) +{ + + if (arg == NULL) + /* nothing to do */; + else if (0 == strcmp(arg, "doc")) + *options |= MPARSE_MDOC; else if (0 == strcmp(arg, "andoc")) - *tflags = MPARSE_AUTO; + /* nothing to do */; else if (0 == strcmp(arg, "an")) - *tflags = MPARSE_MAN; + *options |= MPARSE_MAN; else { - fprintf(stderr, "%s: Bad argument\n", arg); + fprintf(stderr, "%s: -m%s: Bad argument\n", + progname, arg); return(0); } @@ -415,16 +658,23 @@ toptions(struct curparse *curp, char *arg) curp->wlevel = MANDOCLEVEL_WARNING; } else if (0 == strcmp(arg, "tree")) curp->outtype = OUTT_TREE; + else if (0 == strcmp(arg, "man")) + curp->outtype = OUTT_MAN; else if (0 == strcmp(arg, "html")) curp->outtype = OUTT_HTML; + else if (0 == strcmp(arg, "utf8")) + curp->outtype = OUTT_UTF8; + else if (0 == strcmp(arg, "locale")) + curp->outtype = OUTT_LOCALE; else if (0 == strcmp(arg, "xhtml")) - curp->outtype = OUTT_XHTML; + curp->outtype = OUTT_HTML; else if (0 == strcmp(arg, "ps")) curp->outtype = OUTT_PS; else if (0 == strcmp(arg, "pdf")) curp->outtype = OUTT_PDF; else { - fprintf(stderr, "%s: Bad argument\n", arg); + fprintf(stderr, "%s: -T%s: Bad argument\n", + progname, arg); return(0); } @@ -435,7 +685,7 @@ static int woptions(struct curparse *curp, char *arg) { char *v, *o; - const char *toks[6]; + const char *toks[6]; toks[0] = "stop"; toks[1] = "all"; @@ -447,22 +697,23 @@ woptions(struct curparse *curp, char *arg) while (*arg) { o = arg; switch (getsubopt(&arg, UNCONST(toks), &v)) { - case (0): + case 0: curp->wstop = 1; break; - case (1): + case 1: /* FALLTHROUGH */ - case (2): + case 2: curp->wlevel = MANDOCLEVEL_WARNING; break; - case (3): + case 3: curp->wlevel = MANDOCLEVEL_ERROR; break; - case (4): + case 4: curp->wlevel = MANDOCLEVEL_FATAL; break; default: - fprintf(stderr, "-W%s: Bad argument\n", o); + fprintf(stderr, "%s: -W%s: Bad argument\n", + progname, o); return(0); } } @@ -471,16 +722,99 @@ woptions(struct curparse *curp, char *arg) } static void -mmsg(enum mandocerr t, enum mandoclevel lvl, +mmsg(enum mandocerr t, enum mandoclevel lvl, const char *file, int line, int col, const char *msg) { + const char *mparse_msg; - fprintf(stderr, "%s:%d:%d: %s: %s", - file, line, col + 1, - mandoclevels[lvl], mandocerrs[t]); + fprintf(stderr, "%s: %s:", progname, file); + if (line) + fprintf(stderr, "%d:%d:", line, col + 1); + + fprintf(stderr, " %s", mparse_strlevel(lvl)); + + if (NULL != (mparse_msg = mparse_strerror(t))) + fprintf(stderr, ": %s", mparse_msg); + if (msg) fprintf(stderr, ": %s", msg); fputc('\n', stderr); +} + +static void +spawn_pager(void) +{ +#define MAX_PAGER_ARGS 16 + char *argv[MAX_PAGER_ARGS]; + const char *pager; + char *cp; + int fildes[2]; + int argc; + + if (pipe(fildes) == -1) { + fprintf(stderr, "%s: pipe: %s\n", + progname, strerror(errno)); + return; + } + + switch (fork()) { + case -1: + fprintf(stderr, "%s: fork: %s\n", + progname, strerror(errno)); + exit((int)MANDOCLEVEL_SYSERR); + case 0: + close(fildes[0]); + if (dup2(fildes[1], STDOUT_FILENO) == -1) { + fprintf(stderr, "%s: dup output: %s\n", + progname, strerror(errno)); + exit((int)MANDOCLEVEL_SYSERR); + } + return; + default: + break; + } + + /* The original process becomes the pager. */ + + close(fildes[1]); + if (dup2(fildes[0], STDIN_FILENO) == -1) { + fprintf(stderr, "%s: dup input: %s\n", + progname, strerror(errno)); + exit((int)MANDOCLEVEL_SYSERR); + } + + pager = getenv("MANPAGER"); + if (pager == NULL || *pager == '\0') + pager = getenv("PAGER"); + if (pager == NULL || *pager == '\0') + pager = "/usr/bin/more -s"; + cp = mandoc_strdup(pager); + + /* + * Parse the pager command into words. + * Intentionally do not do anything fancy here. + */ + + argc = 0; + while (argc + 1 < MAX_PAGER_ARGS) { + argv[argc++] = cp; + cp = strchr(cp, ' '); + if (cp == NULL) + break; + *cp++ = '\0'; + while (*cp == ' ') + cp++; + if (*cp == '\0') + break; + } + argv[argc] = NULL; + + /* Hand over to the pager. */ + + execvp(argv[0], argv); + fprintf(stderr, "%s: exec: %s\n", + progname, strerror(errno)); + exit((int)MANDOCLEVEL_SYSERR); }