/* $Id: main.c,v 1.225 2015/03/10 13:50:03 schwarze Exp $ */ /* * Copyright (c) 2008-2012 Kristaps Dzonsons * Copyright (c) 2010-2012, 2014, 2015 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 * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include "config.h" #include #include /* MACHINE */ #include #include #include #include #include #include #include #include #include #include #include #include "mandoc.h" #include "mandoc_aux.h" #include "main.h" #include "mdoc.h" #include "man.h" #include "manpath.h" #include "mansearch.h" #if !defined(__GNUC__) || (__GNUC__ < 2) # if !defined(lint) # define __attribute__(x) # 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_LINT, /* -Tlint */ OUTT_PS, /* -Tps */ OUTT_PDF /* -Tpdf */ }; 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 */ out_mdoc outmdoc; /* mdoc 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 int fs_lookup(const struct manpaths *, size_t ipath, const char *, const char *, const char *, struct manpage **, size_t *); static void fs_search(const struct mansearch *, const struct manpaths *, int, char**, struct manpage **, size_t *); static int koptions(int *, char *); #if HAVE_SQLITE3 int mandocdb(int, char**); #endif static int moptions(int *, char *); static void mmsg(enum mandocerr, enum mandoclevel, const char *, int, int, const char *); static void parse(struct curparse *, int, const char *, enum mandoclevel *); static enum mandoclevel passthrough(const char *, int, int); static pid_t spawn_pager(void); static int toptions(struct curparse *, char *); static void usage(enum argmode) __attribute__((noreturn)); static int woptions(struct curparse *, char *); static const int sec_prios[] = {1, 4, 5, 8, 6, 3, 7, 2, 9}; static char help_arg[] = "help"; static char *help_argv[] = {help_arg, NULL}; static const char *progname; int main(int argc, char *argv[]) { struct curparse curp; struct mansearch search; struct manpaths paths; char *auxpaths; char *defos; unsigned char *uc; struct manpage *res, *resp; char *conf_file, *defpaths; size_t isec, i, sz; int prio, best_prio, synopsis_only; char sec; enum mandoclevel rc, rctmp; enum outmode outmode; int fd; int show_usage; int options; int c; pid_t pager_pid; /* 0: don't use; 1: not yet spawned. */ if (argc < 1) progname = "mandoc"; else if ((progname = strrchr(argv[0], '/')) == NULL) progname = argv[0]; else ++progname; #if HAVE_SQLITE3 if (strcmp(progname, BINM_MAKEWHATIS) == 0) return(mandocdb(argc, argv)); #endif /* Search options. */ memset(&paths, 0, sizeof(struct manpaths)); conf_file = defpaths = NULL; auxpaths = NULL; memset(&search, 0, sizeof(struct mansearch)); search.outkey = "Nd"; if (strcmp(progname, BINM_MAN) == 0) search.argmode = ARG_NAME; else if (strcmp(progname, BINM_APROPOS) == 0) search.argmode = ARG_EXPR; else if (strcmp(progname, BINM_WHATIS) == 0) search.argmode = ARG_WORD; else if (strncmp(progname, "help", 4) == 0) search.argmode = ARG_NAME; else search.argmode = ARG_FILE; /* Parser and formatter options. */ memset(&curp, 0, sizeof(struct curparse)); curp.outtype = OUTT_LOCALE; curp.wlevel = MANDOCLEVEL_BADARG; options = MPARSE_SO | MPARSE_UTF8 | MPARSE_LATIN1; defos = NULL; pager_pid = 1; show_usage = 0; synopsis_only = 0; outmode = OUTMODE_DEF; while (-1 != (c = getopt(argc, argv, "aC:cfhI:iK:klM:m:O:S:s:T:VW:w"))) { switch (c) { case 'a': outmode = OUTMODE_ALL; break; case 'C': conf_file = optarg; break; case 'c': pager_pid = 0; break; case 'f': search.argmode = ARG_WORD; break; case 'h': (void)strlcat(curp.outopts, "synopsis,", BUFSIZ); synopsis_only = 1; pager_pid = 0; 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 '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 'S': search.arch = optarg; break; case 's': search.sec = optarg; break; case 'T': if ( ! toptions(&curp, optarg)) return((int)MANDOCLEVEL_BADARG); break; case 'W': if ( ! woptions(&curp, optarg)) return((int)MANDOCLEVEL_BADARG); break; case 'w': outmode = OUTMODE_FLN; break; default: show_usage = 1; break; } } if (show_usage) usage(search.argmode); /* Postprocess options. */ if (outmode == OUTMODE_DEF) { switch (search.argmode) { case ARG_FILE: outmode = OUTMODE_ALL; pager_pid = 0; break; case ARG_NAME: outmode = OUTMODE_ONE; break; default: outmode = OUTMODE_LST; break; } } /* Parse arguments. */ if (argc > 0) { argc -= optind; argv += optind; } resp = NULL; /* * Quirks for help(1) * and for a man(1) section argument without -s. */ if (search.argmode == ARG_NAME) { if (*progname == 'h') { if (argc == 0) { argv = help_argv; argc = 1; } } else if (argc > 1 && ((uc = (unsigned char *)argv[0]) != NULL) && ((isdigit(uc[0]) && (uc[1] == '\0' || (isalpha(uc[1]) && uc[2] == '\0'))) || (uc[0] == 'n' && uc[1] == '\0'))) { search.sec = (char *)uc; argv++; argc--; } if (search.arch == NULL) search.arch = getenv("MACHINE"); #ifdef MACHINE if (search.arch == NULL) search.arch = MACHINE; #endif } rc = MANDOCLEVEL_OK; /* man(1), whatis(1), apropos(1) */ if (search.argmode != ARG_FILE) { if (argc == 0) usage(search.argmode); if (search.argmode == ARG_NAME && outmode == OUTMODE_ONE) search.firstmatch = 1; /* Access the mandoc database. */ manpath_parse(&paths, conf_file, defpaths, auxpaths); #if HAVE_SQLITE3 mansearch_setup(1); if( ! mansearch(&search, &paths, argc, argv, &res, &sz)) usage(search.argmode); #else if (search.argmode != ARG_NAME) { fputs("mandoc: database support not compiled in\n", stderr); return((int)MANDOCLEVEL_BADARG); } sz = 0; #endif if (sz == 0 && search.argmode == ARG_NAME) fs_search(&search, &paths, argc, argv, &res, &sz); if (sz == 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. */ resp = res; 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; } /* mandoc(1) */ if (search.argmode == ARG_FILE && ! moptions(&options, auxpaths)) return((int)MANDOCLEVEL_BADARG); 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 < 1) { if (pager_pid == 1 && isatty(STDOUT_FILENO)) pager_pid = spawn_pager(); parse(&curp, STDIN_FILENO, "", &rc); } while (argc > 0) { rctmp = mparse_open(curp.mp, &fd, resp != NULL ? resp->file : *argv); if (rc < rctmp) rc = rctmp; if (fd != -1) { if (pager_pid == 1 && isatty(STDOUT_FILENO)) pager_pid = spawn_pager(); if (resp == NULL) parse(&curp, fd, *argv, &rc); else if (resp->form & FORM_SRC) { /* For .so only; ignore failure. */ chdir(paths.paths[resp->ipath]); parse(&curp, fd, resp->file, &rc); } else { rctmp = passthrough(resp->file, fd, synopsis_only); if (rc < rctmp) rc = rctmp; } rctmp = mparse_wait(curp.mp); if (rc < rctmp) rc = rctmp; if (argc > 1 && curp.outtype <= OUTT_UTF8) ascii_sepline(curp.outdata); } if (MANDOCLEVEL_OK != rc && curp.wstop) break; if (resp != NULL) resp++; else argv++; if (--argc) mparse_reset(curp.mp); } if (curp.outfree) (*curp.outfree)(curp.outdata); mparse_free(curp.mp); mchars_free(curp.mchars); out: if (search.argmode != ARG_FILE) { manpath_free(&paths); #if HAVE_SQLITE3 mansearch_free(res, sz); mansearch_setup(0); #endif } free(defos); /* * If a pager is attached, flush the pipe leading to it * and signal end of file such that the user can browse * to the end. Then wait for the user to close the pager. */ if (pager_pid != 0 && pager_pid != 1) { fclose(stdout); waitpid(pager_pid, NULL, 0); } return((int)rc); } static void usage(enum argmode argmode) { switch (argmode) { case ARG_FILE: fputs("usage: mandoc [-acfhkl] [-Ios=name] " "[-Kencoding] [-mformat] [-Ooption]\n" "\t [-Toutput] [-Wlevel] [file ...]\n", stderr); break; case ARG_NAME: fputs("usage: man [-acfhklw] [-C file] [-I os=name] " "[-K encoding] [-M path] [-m path]\n" "\t [-O option=value] [-S subsection] [-s section] " "[-T output] [-W level]\n" "\t [section] name ...\n", stderr); break; case ARG_WORD: fputs("usage: whatis [-acfhklw] [-C file] " "[-M path] [-m path] [-O outkey] [-S arch]\n" "\t [-s section] name ...\n", stderr); break; case ARG_EXPR: fputs("usage: apropos [-acfhklw] [-C file] " "[-M path] [-m path] [-O outkey] [-S arch]\n" "\t [-s section] expression ...\n", stderr); break; } exit((int)MANDOCLEVEL_BADARG); } static int fs_lookup(const struct manpaths *paths, size_t ipath, const char *sec, const char *arch, const char *name, struct manpage **res, size_t *ressz) { glob_t globinfo; struct manpage *page; char *file; int form, globres; form = FORM_SRC; mandoc_asprintf(&file, "%s/man%s/%s.%s", paths->paths[ipath], sec, name, sec); if (access(file, R_OK) != -1) goto found; free(file); mandoc_asprintf(&file, "%s/cat%s/%s.0", paths->paths[ipath], sec, name); if (access(file, R_OK) != -1) { form = FORM_CAT; goto found; } free(file); if (arch != NULL) { mandoc_asprintf(&file, "%s/man%s/%s/%s.%s", paths->paths[ipath], sec, arch, name, sec); if (access(file, R_OK) != -1) goto found; free(file); } mandoc_asprintf(&file, "%s/man%s/%s.*", paths->paths[ipath], sec, name); globres = glob(file, 0, NULL, &globinfo); if (globres != 0 && globres != GLOB_NOMATCH) fprintf(stderr, "%s: %s: glob: %s\n", progname, file, strerror(errno)); free(file); if (globres == 0) file = mandoc_strdup(*globinfo.gl_pathv); globfree(&globinfo); if (globres != 0) return(0); found: #if HAVE_SQLITE3 fprintf(stderr, "%s: outdated mandoc.db lacks %s(%s) entry,\n" " consider running # makewhatis %s\n", progname, name, sec, paths->paths[ipath]); #endif *res = mandoc_reallocarray(*res, ++*ressz, sizeof(struct manpage)); page = *res + (*ressz - 1); page->file = file; page->names = NULL; page->output = NULL; page->ipath = ipath; page->bits = NAME_FILE & NAME_MASK; page->sec = (*sec >= '1' && *sec <= '9') ? *sec - '1' + 1 : 10; page->form = form; return(1); } static void fs_search(const struct mansearch *cfg, const struct manpaths *paths, int argc, char **argv, struct manpage **res, size_t *ressz) { const char *const sections[] = {"1", "8", "6", "2", "3", "3p", "5", "7", "4", "9"}; const size_t nsec = sizeof(sections)/sizeof(sections[0]); size_t ipath, isec, lastsz; assert(cfg->argmode == ARG_NAME); *res = NULL; *ressz = lastsz = 0; while (argc) { for (ipath = 0; ipath < paths->sz; ipath++) { if (cfg->sec != NULL) { if (fs_lookup(paths, ipath, cfg->sec, cfg->arch, *argv, res, ressz) && cfg->firstmatch) return; } else for (isec = 0; isec < nsec; isec++) if (fs_lookup(paths, ipath, sections[isec], cfg->arch, *argv, res, ressz) && cfg->firstmatch) return; } if (*ressz == lastsz) fprintf(stderr, "%s: No entry for %s in the manual.\n", progname, *argv); lastsz = *ressz; argv++; argc--; } } static void parse(struct curparse *curp, int fd, const char *file, enum mandoclevel *level) { enum mandoclevel rc; struct mdoc *mdoc; struct man *man; /* Begin by parsing the file itself. */ assert(file); assert(fd >= -1); rc = mparse_readfd(curp->mp, fd, file); /* * With -Wstop and warnings or errors of at least the requested * level, do not produce output. */ if (MANDOCLEVEL_OK != rc && curp->wstop) goto cleanup; /* If unset, allocate output dev now (if applicable). */ if ( ! (curp->outman && curp->outmdoc)) { switch (curp->outtype) { case OUTT_HTML: curp->outdata = html_alloc(curp->mchars, curp->outopts); curp->outfree = html_free; break; case OUTT_UTF8: curp->outdata = utf8_alloc(curp->mchars, curp->outopts); curp->outfree = ascii_free; break; case OUTT_LOCALE: curp->outdata = locale_alloc(curp->mchars, curp->outopts); curp->outfree = ascii_free; break; 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->mchars, curp->outopts); curp->outfree = pspdf_free; break; default: break; } switch (curp->outtype) { case OUTT_HTML: curp->outman = html_man; curp->outmdoc = html_mdoc; break; case OUTT_TREE: curp->outman = tree_man; curp->outmdoc = tree_mdoc; break; case OUTT_MAN: curp->outmdoc = man_mdoc; curp->outman = man_man; break; case OUTT_PDF: /* FALLTHROUGH */ case OUTT_ASCII: /* FALLTHROUGH */ case OUTT_UTF8: /* FALLTHROUGH */ case OUTT_LOCALE: /* FALLTHROUGH */ case OUTT_PS: curp->outman = terminal_man; curp->outmdoc = terminal_mdoc; break; default: break; } } mparse_result(curp->mp, &mdoc, &man, NULL); /* Execute the out device, if it exists. */ if (man && curp->outman) (*curp->outman)(curp->outdata, man); if (mdoc && curp->outmdoc) (*curp->outmdoc)(curp->outdata, mdoc); cleanup: if (*level < rc) *level = rc; } static enum mandoclevel passthrough(const char *file, int fd, int synopsis_only) { const char synb[] = "S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS"; const char synr[] = "SYNOPSIS"; FILE *stream; const char *syscall; char *line; size_t len, off; ssize_t nw; int print; fflush(stdout); if ((stream = fdopen(fd, "r")) == NULL) { close(fd); syscall = "fdopen"; goto fail; } print = 0; while ((line = fgetln(stream, &len)) != NULL) { if (synopsis_only) { if (print) { if ( ! isspace((unsigned char)*line)) goto done; while (len && isspace((unsigned char)*line)) { line++; len--; } } else { if ((len == sizeof(synb) && ! strncmp(line, synb, len - 1)) || (len == sizeof(synr) && ! strncmp(line, synr, len - 1))) print = 1; continue; } } for (off = 0; off < len; off += nw) if ((nw = write(STDOUT_FILENO, line + off, len - off)) == -1 || nw == 0) { fclose(stream); syscall = "write"; goto fail; } } if (ferror(stream)) { fclose(stream); syscall = "fgetln"; goto fail; } done: fclose(stream); return(MANDOCLEVEL_OK); fail: fprintf(stderr, "%s: %s: SYSERR: %s: %s", progname, file, syscall, strerror(errno)); return(MANDOCLEVEL_SYSERR); } static int koptions(int *options, char *arg) { 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")) /* nothing to do */; else if (0 == strcmp(arg, "an")) *options |= MPARSE_MAN; else { fprintf(stderr, "%s: -m %s: Bad argument\n", progname, arg); return(0); } return(1); } static int toptions(struct curparse *curp, char *arg) { if (0 == strcmp(arg, "ascii")) curp->outtype = OUTT_ASCII; else if (0 == strcmp(arg, "lint")) { curp->outtype = OUTT_LINT; 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_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: -T %s: Bad argument\n", progname, arg); return(0); } return(1); } static int woptions(struct curparse *curp, char *arg) { char *v, *o; const char *toks[7]; toks[0] = "stop"; toks[1] = "all"; toks[2] = "warning"; toks[3] = "error"; toks[4] = "unsupp"; toks[5] = "fatal"; toks[6] = NULL; while (*arg) { o = arg; switch (getsubopt(&arg, UNCONST(toks), &v)) { case 0: curp->wstop = 1; break; case 1: /* FALLTHROUGH */ case 2: curp->wlevel = MANDOCLEVEL_WARNING; break; case 3: curp->wlevel = MANDOCLEVEL_ERROR; break; case 4: curp->wlevel = MANDOCLEVEL_UNSUPP; break; case 5: curp->wlevel = MANDOCLEVEL_BADARG; break; default: fprintf(stderr, "%s: -W %s: Bad argument\n", progname, o); return(0); } } return(1); } static void mmsg(enum mandocerr t, enum mandoclevel lvl, const char *file, int line, int col, const char *msg) { const char *mparse_msg; 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 pid_t spawn_pager(void) { #define MAX_PAGER_ARGS 16 char *argv[MAX_PAGER_ARGS]; const char *pager; char *cp; int fildes[2]; int argc; pid_t pager_pid; if (pipe(fildes) == -1) { fprintf(stderr, "%s: pipe: %s\n", progname, strerror(errno)); return(0); } switch (pager_pid = fork()) { case -1: fprintf(stderr, "%s: fork: %s\n", progname, strerror(errno)); exit((int)MANDOCLEVEL_SYSERR); case 0: break; default: close(fildes[0]); if (dup2(fildes[1], STDOUT_FILENO) == -1) { fprintf(stderr, "%s: dup output: %s\n", progname, strerror(errno)); exit((int)MANDOCLEVEL_SYSERR); } close(fildes[1]); return(pager_pid); } /* The child 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); } close(fildes[0]); 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); }