diff options
Diffstat (limited to 'posix/wordexp.c')
| -rw-r--r-- | posix/wordexp.c | 270 |
1 files changed, 193 insertions, 77 deletions
diff --git a/posix/wordexp.c b/posix/wordexp.c index 42b22ec..abd55a5 100644 --- a/posix/wordexp.c +++ b/posix/wordexp.c @@ -1,5 +1,5 @@ /* POSIX.2 wordexp implementation. - Copyright (C) 1997 Free Software Foundation, Inc. + Copyright (C) 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Tim Waugh <tim@cyberelk.demon.co.uk>. @@ -51,11 +51,13 @@ /* Some forward declarations */ static int parse_dollars (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, - wordexp_t *pwordexp) + wordexp_t *pwordexp, const char *ifs, + const char *ifs_white) internal_function; static int parse_backtick (char **word, size_t *word_length, size_t *max_length, const char *words, - size_t *offset, int flags, wordexp_t *pwordexp) + size_t *offset, int flags, wordexp_t *pwordexp, + const char *ifs, const char *ifs_white) internal_function; static int eval_expr (char *expr, int *result) internal_function; @@ -315,7 +317,7 @@ static int internal_function parse_glob (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, - wordexp_t *pwordexp, char *ifs) + wordexp_t *pwordexp, const char *ifs, const char *ifs_white) { /* We are poised just after a '*' or a '{'. */ int error; @@ -332,7 +334,7 @@ parse_glob (char **word, size_t *word_length, size_t *max_length, case '$': error = parse_dollars (word, word_length, max_length, words, offset, - flags, pwordexp); + flags, pwordexp, ifs, ifs_white); if (error) return error; @@ -583,8 +585,8 @@ parse_arith (char **word, size_t *word_length, size_t *max_length, { case '$': error = parse_dollars (&expr, &expr_length, &expr_maxlen, - words, offset, flags, NULL); - /* The NULL here is to tell parse_dollars not to + words, offset, flags, NULL, NULL, NULL); + /* The first NULL here is to tell parse_dollars not to * split the fields. */ if (error) @@ -597,8 +599,8 @@ parse_arith (char **word, size_t *word_length, size_t *max_length, case '`': (*offset)++; error = parse_backtick (&expr, &expr_length, &expr_maxlen, - words, offset, flags, NULL); - /* The NULL here is to tell parse_backtick not to + words, offset, flags, NULL, NULL, NULL); + /* The first NULL here is to tell parse_backtick not to * split the fields. */ if (error) @@ -696,20 +698,15 @@ parse_arith (char **word, size_t *word_length, size_t *max_length, static int internal_function exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length, - int flags, wordexp_t *pwordexp) + int flags, wordexp_t *pwordexp, const char *ifs, + const char *ifs_white) { int fildes[2]; int bufsize = 128; int buflen; - int state = 0; int i; char *buffer; pid_t pid; - /* 'state' is: - * 0 until first non-(whitespace-ifs) - * 1 after a non-ifs - * 2 after non-(whitespace-ifs) - */ /* Don't fork() unless necessary */ if (!comm || !*comm) @@ -775,49 +772,99 @@ exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length, close (fildes[0]); return 0; } - - /* Not quoted - split fields. - * NB. This isn't done properly yet. - */ - while (1) + else + /* Not quoted - split fields */ { - if ((buflen = read (fildes[0], buffer, bufsize)) < 1) - { - if (__waitpid (pid, NULL, WNOHANG) == 0) - continue; - if ((read (fildes[0], buffer, bufsize)) < 1) - break; - } + int copying = 0; + /* 'copying' is: + * 0 when searching for first character in a field not IFS white space + * 1 when copying the text of a field + * 2 when searching for possible non-whitespace IFS + */ - for (i = 0; i < buflen; ++i) + while (1) { - /* What if these aren't field separators? FIX */ - if (buffer[i] == ' ' || buffer[i] == '\t' || buffer[i] == '\n') + if ((buflen = read (fildes[0], buffer, bufsize)) < 1) { - if (state != 0) - state = 2; - continue; + if (__waitpid (pid, NULL, WNOHANG) == 0) + continue; + if ((read (fildes[0], buffer, bufsize)) < 1) + break; } - if (state == 2) + for (i = 0; i < buflen; ++i) { - /* End of word */ - if (w_addword (pwordexp, *word) == WRDE_NOSPACE) + if (strchr (ifs, buffer[i]) != NULL) { - close (fildes[0]); - return WRDE_NOSPACE; - } + /* Current character is IFS */ + if (strchr (ifs_white, buffer[i]) == NULL) + { + /* Current character is IFS but not whitespace */ + if (copying == 2) + { + /* current character + * | + * V + * eg: text<space><comma><space>moretext + * + * So, strip whitespace IFS (like at the start) + */ + copying = 0; + continue; + } + + copying = 0; + /* fall through and delimit field.. */ + } + else + { + /* Current character is IFS white space */ - *word = NULL; - *word_length = 0; - } + /* If not copying a field, ignore it */ + if (copying != 1) + continue; - state = 1; - *word = w_addchar (*word, word_length, max_length, buffer[i]); - if (*word == NULL) - { - close (fildes[0]); - return WRDE_NOSPACE; + /* End of field (search for non-IFS afterwards) */ + copying = 2; + } + + /* First IFS white space, or IFS non-whitespace. + * Delimit the field. */ + if (!*word) + { + /* This field is null, so make it an empty string */ + *word = w_addchar (*word, word_length, max_length, 0); + if (*word == NULL) + { + close (fildes[0]); + return WRDE_NOSPACE; + } + } + + if (w_addword (pwordexp, *word) == WRDE_NOSPACE) + { + /* Should do __waitpid? */ + close (fildes[0]); + return WRDE_NOSPACE; + } + + *word = NULL; + *word_length = 0; + *max_length = 0; + /* fall back round the loop.. */ + } + else + { + /* Not IFS character */ + copying = 1; + *word = w_addchar (*word, word_length, max_length, + buffer[i]); + if (*word == NULL) + { + close (fildes[0]); + return WRDE_NOSPACE; + } + } } } } @@ -828,7 +875,8 @@ exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length, static int parse_comm (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, wordexp_t *pwordexp) + const char *words, size_t *offset, int flags, wordexp_t *pwordexp, + const char *ifs, const char *ifs_white) { /* We are poised just after "$(" */ int paren_depth = 1; @@ -846,7 +894,7 @@ parse_comm (char **word, size_t *word_length, size_t *max_length, { /* Go -- give script to the shell */ error = exec_comm (comm, word, word_length, max_length, flags, - pwordexp); + pwordexp, ifs, ifs_white); free (comm); return error; } @@ -877,7 +925,8 @@ parse_comm (char **word, size_t *word_length, size_t *max_length, static int internal_function parse_param (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, wordexp_t *pwordexp) + const char *words, size_t *offset, int flags, wordexp_t *pwordexp, + const char *ifs, const char *ifs_white) { /* We are poised just after "$" */ enum remove_pattern_enum @@ -1264,8 +1313,65 @@ envsubst: /* Quoted - no field split */ *word = w_addstr (*word, word_length, max_length, value); else - /* Should field-split here - FIX */ - *word = w_addstr (*word, word_length, max_length, value); + { + /* Need to field-split */ + char *field_begin = value; + int seen_nonws_ifs = 0; + + do + { + char *field_end = field_begin; + char *field; + char *next_field; + char ch; + + /* Skip IFS whitespace before the field */ + while (*field_begin && strchr (ifs_white, *field_begin) != NULL) + field_begin++; + + if (!seen_nonws_ifs && *field_begin == 0) + /* Nothing but whitespace */ + return 0; + + /* Search for the end of the field */ + field_end = field_begin; + while (*field_end && strchr (ifs, *field_end) == NULL) + field_end++; + + /* Set up pointer to the character after end of field */ + ch = *field_end; + next_field = ch ? field_end : NULL; + + /* Skip whitespace IFS after the field */ + while (next_field && *next_field && strchr (ifs_white, *next_field)) + next_field++; + + /* Skip at most one non-whitespace IFS character after the field */ + seen_nonws_ifs = 0; + if (next_field && *next_field && strchr (ifs, *next_field)) + { + seen_nonws_ifs = 1; + next_field++; + } + + /* Null-terminate it and make a copy */ + *field_end = 0; + field = __strdup (field_begin); + if (field == NULL) + goto no_space; + + /* Tag the field onto the word list */ + if (w_addword (pwordexp, field) == WRDE_NOSPACE) + return WRDE_NOSPACE; + + *word = NULL; + *word_length = *max_length = 0; + + field_begin = next_field; + } while (seen_nonws_ifs || (field_begin && *field_begin)); + + return 0; + } return *word ? 0 : WRDE_NOSPACE; @@ -1292,7 +1398,7 @@ static int internal_function parse_dollars (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, - wordexp_t *pwordexp) + wordexp_t *pwordexp, const char *ifs, const char *ifs_white) { /* We are poised _at_ "$" */ switch (words[1 + *offset]) @@ -1317,7 +1423,7 @@ parse_dollars (char **word, size_t *word_length, size_t *max_length, (*offset) += 2; return parse_comm (word, word_length, max_length, words, offset, flags, - pwordexp); + pwordexp, ifs, ifs_white); case '[': (*offset) += 2; @@ -1329,14 +1435,14 @@ parse_dollars (char **word, size_t *word_length, size_t *max_length, default: ++(*offset); /* parse_param needs to know if "{" is there */ return parse_param (word, word_length, max_length, words, offset, flags, - pwordexp); + pwordexp, ifs, ifs_white); } } static int parse_backtick (char **word, size_t *word_length, size_t *max_length, const char *words, size_t *offset, int flags, - wordexp_t *pwordexp) + wordexp_t *pwordexp, const char *ifs, const char *ifs_white) { /* We are poised just after "`" */ int error; @@ -1352,7 +1458,7 @@ parse_backtick (char **word, size_t *word_length, size_t *max_length, case '`': /* Go -- give the script to the shell */ error = exec_comm (comm, word, word_length, max_length, flags, - pwordexp); + pwordexp, ifs, ifs_white); free (comm); return error; @@ -1414,8 +1520,8 @@ parse_dquote (char **word, size_t *word_length, size_t *max_length, case '$': error = parse_dollars (word, word_length, max_length, words, offset, - flags, NULL); - /* The NULL here is to tell parse_dollars not to + flags, NULL, NULL, NULL); + /* The first NULL here is to tell parse_dollars not to * split the fields. */ if (error) @@ -1429,8 +1535,8 @@ parse_dquote (char **word, size_t *word_length, size_t *max_length, ++(*offset); error = parse_backtick (word, word_length, max_length, words, - offset, flags, NULL); - /* The NULL here is to tell parse_backtick not to + offset, flags, NULL, NULL, NULL); + /* The first NULL here is to tell parse_backtick not to * split the fields. */ if (error) @@ -1527,25 +1633,33 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags) ifs = getenv ("IFS"); if (!ifs) - ifs = strcpy (ifs_white, " \t\n"); + /* NULL IFS means no field-splitting is to be performed */ + ifs = strcpy (ifs_white, ""); else { char *ifsch = ifs; char *whch = ifs_white; + /* Start off with no whitespace IFS characters */ + ifs_white[0] = '\0'; + while (*ifsch != '\0') - if ((*ifsch == ' ') || (*ifsch == '\t') || (*ifsch == '\n')) - { - /* White space IFS. See first whether it is already in our - collection. */ - char *runp = ifs_white; + { + if ((*ifsch == ' ') || (*ifsch == '\t') || (*ifsch == '\n')) + { + /* Whitespace IFS. See first whether it is already in our + collection. */ + char *runp = ifs_white; - while (runp < whch && *runp != '\0' && *runp != *ifsch) - ++runp; + while (runp < whch && *runp != '\0' && *runp != *ifsch) + ++runp; - if (runp == whch) - *whch++ = *ifsch; - } + if (runp == whch) + *whch++ = *ifsch; + } + + ifsch++; + } *whch = '\0'; } @@ -1578,7 +1692,7 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags) case '$': error = parse_dollars (&word, &word_length, &max_length, words, - &words_offset, flags, pwordexp); + &words_offset, flags, pwordexp, ifs, ifs_white); if (error) goto do_error; @@ -1591,7 +1705,8 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags) ++words_offset; error = parse_backtick (&word, &word_length, &max_length, words, - &words_offset, flags, pwordexp); + &words_offset, flags, pwordexp, ifs, + ifs_white); if (error) goto do_error; @@ -1630,7 +1745,7 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags) case '*': case '{': error = parse_glob (&word, &word_length, &max_length, words, - &words_offset, flags, pwordexp, ifs); + &words_offset, flags, pwordexp, ifs, ifs_white); if (error) goto do_error; @@ -1670,6 +1785,7 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags) word = NULL; word_length = 0; + max_length = 0; break; } |