From: Paul Eggert Date: Sun, 24 May 2015 21:20:09 +0000 (-0700) Subject: Improve etags I/O error reporting X-Git-Tag: emacs-25.0.90~1988 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=379d77dfa3a03083517114e1ce32bb72137aea05;p=emacs.git Improve etags I/O error reporting * lib-src/etags.c: Don't include sys/types.h and sys/stat.h; no longer needed. (infilename): New static var. (process_file_name): Don't call 'stat'. Instead, just open the file for reading and report any errors. Don't bother making a copy of the file argument; it's not needed. Be more careful to use the failing errno when reporting an error. Quote the real name better (though no perfectly) when passing it to the shell. (reset_input): New function, which reports I/O errors. All uses of 'rewind' changed to use this function. (perhaps_more_input): New function, which also checks for I/O errors. All uses of 'feof' changed to use this function. (analyze_regex): Report an error if fclose fails. (readline_internal): Report an error if getc fails. (etags_mktmp): Return an error if close fails. --- diff --git a/lib-src/etags.c b/lib-src/etags.c index ea337d41008..48d2299410a 100644 --- a/lib-src/etags.c +++ b/lib-src/etags.c @@ -127,8 +127,6 @@ char pot_etags_version[] = "@(#) pot revision number is 17.38.1.4"; #include #include #include -#include -#include #include #include #include @@ -355,7 +353,7 @@ static void just_read_file (FILE *); static language *get_language_from_langname (const char *); static void readline (linebuffer *, FILE *); -static long readline_internal (linebuffer *, FILE *); +static long readline_internal (linebuffer *, FILE *, char const *); static bool nocase_tail (const char *); static void get_tag (char *, char **); @@ -407,6 +405,7 @@ static ptrdiff_t whatlen_max; /* maximum length of any 'what' member */ static fdesc *fdhead; /* head of file description list */ static fdesc *curfdp; /* current file description */ +static char *infilename; /* current input file name */ static int lineno; /* line number of current line */ static long charno; /* current character number */ static long linecharno; /* charno of start of current line */ @@ -1247,7 +1246,7 @@ main (int argc, char **argv) if (parsing_stdin) fatal ("cannot parse standard input AND read file names from it", (char *)NULL); - while (readline_internal (&filename_lb, stdin) > 0) + while (readline_internal (&filename_lb, stdin, "-") > 0) process_file_name (filename_lb.buffer, lang); } else @@ -1470,7 +1469,6 @@ get_language_from_filename (char *file, int case_sensitive) static void process_file_name (char *file, language *lang) { - struct stat stat_buf; FILE *inf; fdesc *fdp; compressor *compr; @@ -1487,13 +1485,13 @@ process_file_name (char *file, language *lang) compr = get_compressor_from_suffix (file, &ext); if (compr) { - real_name = compressed_name = savestr (file); + compressed_name = file; uncompressed_name = savenstr (file, ext - file); } else { compressed_name = NULL; - real_name = uncompressed_name = savestr (file); + uncompressed_name = file; } /* If the canonicalized uncompressed name @@ -1505,83 +1503,91 @@ process_file_name (char *file, language *lang) goto cleanup; } - if (stat (real_name, &stat_buf) != 0) + inf = fopen (file, "r" FOPEN_BINARY); + if (inf) + real_name = file; + else { - /* Reset real_name and try with a different name. */ - real_name = NULL; - if (compressed_name != NULL) /* try with the given suffix */ + int file_errno = errno; + if (compressed_name) { - if (stat (uncompressed_name, &stat_buf) == 0) + /* Try with the given suffix. */ + inf = fopen (uncompressed_name, "r" FOPEN_BINARY); + if (inf) real_name = uncompressed_name; } - else /* try all possible suffixes */ + else { + /* Try all possible suffixes. */ for (compr = compressors; compr->suffix != NULL; compr++) { compressed_name = concat (file, ".", compr->suffix); - if (stat (compressed_name, &stat_buf) != 0) + inf = fopen (compressed_name, "r" FOPEN_BINARY); + if (inf) + { + real_name = compressed_name; + break; + } + if (MSDOS) { - if (MSDOS) + char *suf = compressed_name + strlen (file); + size_t suflen = strlen (compr->suffix) + 1; + for ( ; suf[1]; suf++, suflen--) { - char *suf = compressed_name + strlen (file); - size_t suflen = strlen (compr->suffix) + 1; - for ( ; suf[1]; suf++, suflen--) + memmove (suf, suf + 1, suflen); + inf = fopen (compressed_name, "r" FOPEN_BINARY); + if (inf) { - memmove (suf, suf + 1, suflen); - if (stat (compressed_name, &stat_buf) == 0) - { - real_name = compressed_name; - break; - } + real_name = compressed_name; + break; } - if (real_name != NULL) - break; - } /* MSDOS */ - free (compressed_name); - compressed_name = NULL; - } - else - { - real_name = compressed_name; - break; + } + if (inf) + break; } + free (compressed_name); + compressed_name = NULL; } } - if (real_name == NULL) + if (! inf) { + errno = file_errno; perror (file); goto cleanup; } - } /* try with a different name */ - - if (!S_ISREG (stat_buf.st_mode)) - { - error ("skipping %s: it is not a regular file.", real_name); - goto cleanup; } + if (real_name == compressed_name) { + fclose (inf); tmp_name = etags_mktmp (); if (!tmp_name) inf = NULL; else { - char *cmd1 = concat (compr->command, " ", real_name); - char *cmd = concat (cmd1, " > ", tmp_name); + char *cmd1 = concat (compr->command, " '", real_name); + char *cmd = concat (cmd1, "' > ", tmp_name); free (cmd1); + int tmp_errno; if (system (cmd) == -1) - inf = NULL; + { + inf = NULL; + tmp_errno = EINVAL; + } else - inf = fopen (tmp_name, "r" FOPEN_BINARY); + { + inf = fopen (tmp_name, "r" FOPEN_BINARY); + tmp_errno = errno; + } free (cmd); + errno = tmp_errno; + } + + if (!inf) + { + perror (real_name); + goto cleanup; } - } - else - inf = fopen (real_name, "r" FOPEN_BINARY); - if (inf == NULL) - { - perror (real_name); - goto cleanup; } process_file (inf, uncompressed_name, lang); @@ -1596,8 +1602,10 @@ process_file_name (char *file, language *lang) pfatal (file); cleanup: - free (compressed_name); - free (uncompressed_name); + if (compressed_name != file) + free (compressed_name); + if (uncompressed_name != file) + free (uncompressed_name); last_node = NULL; curfdp = NULL; return; @@ -1609,6 +1617,7 @@ process_file (FILE *fh, char *fn, language *lang) static const fdesc emptyfdesc; fdesc *fdp; + infilename = fn; /* Create a new input file description entry. */ fdp = xnew (1, fdesc); *fdp = emptyfdesc; @@ -1672,6 +1681,13 @@ process_file (FILE *fh, char *fn, language *lang) } } +static void +reset_input (FILE *inf) +{ + if (fseek (inf, 0, SEEK_SET) != 0) + perror (infilename); +} + /* * This routine opens the specified file and calls the function * which finds the function and type definitions. @@ -1702,7 +1718,7 @@ find_entries (FILE *inf) /* Else look for sharp-bang as the first two characters. */ if (parser == NULL - && readline_internal (&lb, inf) > 0 + && readline_internal (&lb, inf, infilename) > 0 && lb.len >= 2 && lb.buffer[0] == '#' && lb.buffer[1] == '!') @@ -1731,7 +1747,7 @@ find_entries (FILE *inf) } } - rewind (inf); + reset_input (inf); /* Else try to guess the language given the case insensitive file name. */ if (parser == NULL) @@ -1755,7 +1771,7 @@ find_entries (FILE *inf) if (old_last_node == last_node) /* No Fortran entries found. Try C. */ { - rewind (inf); + reset_input (inf); curfdp->lang = get_language_from_langname (cplusplus ? "c++" : "c"); find_entries (inf); } @@ -2965,7 +2981,7 @@ do { \ #define CNL() \ do { \ - CNL_SAVE_DEFINEDEF(); \ + CNL_SAVE_DEFINEDEF (); \ if (savetoken.valid) \ { \ token = savetoken; \ @@ -2994,6 +3010,12 @@ make_C_tag (bool isfun) token.valid = false; } +static bool +perhaps_more_input (FILE *inf) +{ + return !feof (inf) && !ferror (inf); +} + /* * C_entries () @@ -3051,7 +3073,7 @@ C_entries (int c_ext, FILE *inf) { qualifier = "::"; qlen = 2; } - while (!feof (inf)) + while (perhaps_more_input (inf)) { c = *lp++; if (c == '\\') @@ -3892,13 +3914,10 @@ Yacc_entries (FILE *inf) /* Useful macros. */ #define LOOP_ON_INPUT_LINES(file_pointer, line_buffer, char_pointer) \ - for (; /* loop initialization */ \ - !feof (file_pointer) /* loop test */ \ - && /* instructions at start of loop */ \ - (readline (&line_buffer, file_pointer), \ - char_pointer = line_buffer.buffer, \ - true); \ - ) + while (perhaps_more_input (file_pointer) \ + && (readline (&(line_buffer), file_pointer), \ + (char_pointer) = (line_buffer).buffer, \ + true)) \ #define LOOKING_AT(cp, kw) /* kw is the keyword, a literal string */ \ ((assert ("" kw), true) /* syntax error if not a literal string */ \ @@ -3919,7 +3938,7 @@ Yacc_entries (FILE *inf) static void just_read_file (FILE *inf) { - while (!feof (inf)) + while (perhaps_more_input (inf)) readline (&lb, inf); } @@ -4074,7 +4093,7 @@ Ada_getit (FILE *inf, const char *name_qualifier) char *name; char c; - while (!feof (inf)) + while (perhaps_more_input (inf)) { dbp = skip_spaces (dbp); if (*dbp == '\0' @@ -4576,7 +4595,7 @@ Pascal_functions (FILE *inf) verify_tag = false; /* check if "extern" is ahead */ - while (!feof (inf)) /* long main loop to get next char */ + while (perhaps_more_input (inf)) /* long main loop to get next char */ { c = *dbp++; if (c == '\0') /* if end of line */ @@ -5033,7 +5052,7 @@ TEX_mode (FILE *inf) TEX_opgrp = '<'; TEX_clgrp = '>'; } - rewind (inf); + reset_input (inf); } /* Read environment and prepend it to the default string. @@ -5279,7 +5298,7 @@ prolog_skip_comment (linebuffer *plb, FILE *inf) return; readline (plb, inf); } - while (!feof (inf)); + while (perhaps_more_input (inf)); } /* @@ -5629,10 +5648,11 @@ analyze_regex (char *regex_arg) if (regexfp == NULL) pfatal (regexfile); linebuffer_init (®exbuf); - while (readline_internal (®exbuf, regexfp) > 0) + while (readline_internal (®exbuf, regexfp, regexfile) > 0) analyze_regex (regexbuf.buffer); free (regexbuf.buffer); - fclose (regexfp); + if (fclose (regexfp) != 0) + pfatal (regexfile); } break; @@ -5972,11 +5992,11 @@ get_tag (register char *bp, char **namepp) * appended to `filebuf'. */ static long -readline_internal (linebuffer *lbp, register FILE *stream) +readline_internal (linebuffer *lbp, FILE *stream, char const *filename) { char *buffer = lbp->buffer; - register char *p = lbp->buffer; - register char *pend; + char *p = lbp->buffer; + char *pend; int chars_deleted; pend = p + lbp->size; /* Separate to avoid 386/IX compiler bug. */ @@ -5995,6 +6015,8 @@ readline_internal (linebuffer *lbp, register FILE *stream) } if (c == EOF) { + if (ferror (stream)) + perror (filename); *p = '\0'; chars_deleted = 0; break; @@ -6055,7 +6077,7 @@ readline (linebuffer *lbp, FILE *stream) long result; linecharno = charno; /* update global char number of line start */ - result = readline_internal (lbp, stream); /* read line */ + result = readline_internal (lbp, stream, infilename); /* read line */ lineno += 1; /* increment global line number */ charno += result; /* increment global char number */ @@ -6386,13 +6408,13 @@ etags_mktmp (void) char *templt = concat (tmpdir, slash, "etXXXXXX"); int fd = mkostemp (templt, O_CLOEXEC); - if (fd < 0) + if (fd < 0 || close (fd) != 0) { + int temp_errno = errno; free (templt); + errno = temp_errno; templt = NULL; } - else - close (fd); #if defined (DOS_NT) /* The file name will be used in shell redirection, so it needs to have @@ -6402,6 +6424,7 @@ etags_mktmp (void) if (*p == '/') *p = '\\'; #endif + return templt; }