diff options
Diffstat (limited to 'posix/wordexp.c')
| -rw-r--r-- | posix/wordexp.c | 430 |
1 files changed, 202 insertions, 228 deletions
diff --git a/posix/wordexp.c b/posix/wordexp.c index 443dc4697d..54f830cc2c 100644 --- a/posix/wordexp.c +++ b/posix/wordexp.c @@ -973,45 +973,63 @@ parse_comm (char **word, size_t *word_length, size_t *max_length, { /* We are poised just after "$(" */ int paren_depth = 1; - int error; + int error = 0; size_t comm_length = 0; size_t comm_maxlen = 0; char *comm = NULL; + int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */ for (; words[*offset]; ++(*offset)) { switch (words[*offset]) { + case '\'': + if (quoted == 0) + quoted = 1; + else if (quoted == 1) + quoted = 0; + + break; + + case '"': + if (quoted == 0) + quoted = 2; + else if (quoted == 2) + quoted = 0; + + break; + case ')': - if (--paren_depth == 0) + if (!quoted && --paren_depth == 0) { /* Go -- give script to the shell */ - error = exec_comm (comm, word, word_length, max_length, flags, - pwordexp, ifs, ifs_white); - free (comm); + if (comm) + { + error = exec_comm (comm, word, word_length, max_length, + flags, pwordexp, ifs, ifs_white); + free (comm); + } + return error; } /* This is just part of the script */ - comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); - if (comm == NULL) - return WRDE_NOSPACE; - break; case '(': - ++paren_depth; - default: - comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); - if (comm == NULL) - return WRDE_NOSPACE; - - break; + if (!quoted) + ++paren_depth; } + + comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); + if (comm == NULL) + return WRDE_NOSPACE; } /* Premature end */ - free (comm); + if (comm) + free (comm); + return WRDE_SYNTAX; } @@ -1022,73 +1040,100 @@ parse_param (char **word, size_t *word_length, size_t *max_length, const char *ifs, const char *ifs_white, int quoted) { /* We are poised just after "$" */ - enum remove_pattern_enum + enum action { - RP_NONE = 0, - RP_SHORT_LEFT, - RP_LONG_LEFT, - RP_SHORT_RIGHT, - RP_LONG_RIGHT + ACT_NONE, + ACT_RP_SHORT_LEFT = '#', + ACT_RP_LONG_LEFT = 'L', + ACT_RP_SHORT_RIGHT = '%', + ACT_RP_LONG_RIGHT = 'R', + ACT_NULL_ERROR = '?', + ACT_NULL_SUBST = '-', + ACT_NONNULL_SUBST = '+', + ACT_NULL_ASSIGN = '=' }; - size_t start = *offset; size_t env_length = 0; size_t env_maxlen = 0; size_t pat_length = 0; size_t pat_maxlen = 0; + size_t start = *offset; char *env = NULL; char *pattern = NULL; char *value = NULL; - char action = '\0'; - enum remove_pattern_enum remove = RP_NONE; - int colon_seen = 0; + enum action action = ACT_NONE; int depth = 0; + int colon_seen = 0; int seen_hash = 0; int free_value = 0; + int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */ int error; + int brace = words[*offset] == '{'; + + if (brace) + ++*offset; for (; words[*offset]; ++(*offset)) { - switch (words[*offset]) - { - case '{': - ++depth; + int special; - if (action != '\0' || remove != RP_NONE) + if (action != ACT_NONE) + { + switch (words[*offset]) { - pattern = w_addchar (pattern, &pat_length, &pat_maxlen, - words[*offset]); - if (pattern == NULL) - goto no_space; + case '{': + if (!pattern_is_quoted) + ++depth; + break; + case '}': + if (!pattern_is_quoted) + { + if (depth == 0) + goto envsubst; + --depth; + } break; - } - if (*offset == start) - break; + case '\\': + if (!pattern_is_quoted && words[++*offset] == '\0') + goto syntax; + break; - /* Otherwise evaluate */ - /* (and re-parse this character) */ - --(*offset); - goto envsubst; + case '\'': + if (pattern_is_quoted == 0) + pattern_is_quoted = 1; + else if (pattern_is_quoted == 1) + pattern_is_quoted = 0; - case '}': - if (words[start] != '{') - --(*offset); + break; - if (action != '\0' || remove != RP_NONE) - { - if (--depth) - { - pattern = w_addchar (pattern, &pat_length, &pat_maxlen, - words[*offset]); - if (pattern == NULL) - goto no_space; + case '"': + if (pattern_is_quoted == 0) + pattern_is_quoted = 2; + else if (pattern_is_quoted == 2) + pattern_is_quoted = 0; - break; - } + break; } - /* Evaluate */ + pattern = w_addchar (pattern, &pat_length, &pat_maxlen, + words[*offset]); + if (pattern == NULL) + goto no_space; + + continue; + } + + switch (words[*offset]) + { + case '}': + if (!brace) + goto end_of_word; + + if (env == NULL) + goto syntax; + + /* Evaluate. */ goto envsubst; case '#': @@ -1100,173 +1145,104 @@ parse_param (char **word, size_t *word_length, size_t *max_length, goto envsubst; } - if (words[start] != '{') - { - /* Evaluate */ - /* (and re-parse this character) */ - --(*offset); - goto envsubst; - } + if (!brace) + /* Evaluate */ + /* (and re-parse this character) */ + goto end_of_word; /* At the start? (i.e. 'string length') */ - if (*offset == start + 1) + if (env == NULL) { seen_hash = 1; - break; + continue; } else if (seen_hash) goto syntax; - /* Separating variable name from prefix pattern? */ - if (remove == RP_NONE) - { - remove = RP_SHORT_LEFT; - break; - } - else if (remove == RP_SHORT_LEFT) + action = ACT_RP_SHORT_LEFT; + if (words[1 + *offset] == '#') { - remove = RP_LONG_LEFT; - break; + ++*offset; + action = ACT_RP_LONG_LEFT; } - /* Must be part of prefix/suffix pattern. */ - pattern = w_addchar (pattern, &pat_length, &pat_maxlen, - words[*offset]); - if (pattern == NULL) - goto no_space; - - break; + continue; case '%': + if (!brace) + /* Re-parse this character after substitution */ + goto end_of_word; + if (!env || !*env) goto syntax; - /* Separating variable name from suffix pattern? */ - if (remove == RP_NONE) - { - remove = RP_SHORT_RIGHT; - break; - } - else if (remove == RP_SHORT_RIGHT) + if (seen_hash) + goto syntax; + + action = ACT_RP_SHORT_RIGHT; + if (words[1 + *offset] == '%') { - remove = RP_LONG_RIGHT; - break; + ++*offset; + action = ACT_RP_LONG_RIGHT; } - /* Must be part of prefix/suffix pattern. */ - pattern = w_addchar (pattern, &pat_length, &pat_maxlen, - words[*offset]); - if (pattern == NULL) - goto no_space; - - break; + continue; case ':': + if (!brace) + goto end_of_word; + if (!env || !*env) goto syntax; - if (action != '\0' || remove != RP_NONE) - { - pattern = w_addchar (pattern, &pat_length, &pat_maxlen, - words[*offset]); - if (pattern == NULL) - goto no_space; - - break; - } + if (seen_hash) + goto syntax; - if ((words[1 + *offset] == '-') || (words[1 + *offset] == '=') - || (words[1 + *offset] == '?') || (words[1 + *offset] == '+')) - { - colon_seen = 1; - break; - } + if (words[1 + *offset] != '-' && words[1 + *offset] != '=' + && words[1 + *offset] != '?' && words[1 + *offset] != '+') + goto syntax; - goto syntax; + colon_seen = 1; + action = words[++*offset]; + continue; case '-': case '=': case '?': case '+': - if (!env || !*env) - goto syntax; + if (!brace) + goto end_of_word; - if (seen_hash) + if (!env || !*env) goto syntax; - if (action != '\0' || remove != RP_NONE) - { - pattern = w_addchar (pattern, &pat_length, &pat_maxlen, - words[*offset]); - if (pattern == NULL) - goto no_space; - - break; - } - action = words[*offset]; - break; - - case '\\': - if (action != '\0' || remove != RP_NONE) - { - /* Um. Is this right? */ - error = parse_qtd_backslash (word, word_length, max_length, - words, offset); - if (error == 0) - break; - } - else - { - error = WRDE_SYNTAX; - } - - if (env) - free (env); - - if (pattern != NULL) - free (pattern); - - return error; - - default: - if (action != '\0' || remove != RP_NONE) - { - pattern = w_addchar (pattern, &pat_length, &pat_maxlen, - words[*offset]); - if (pattern == NULL) - goto no_space; - - break; - } - else - { - int special = (strchr ("*@$", words[*offset]) != NULL - || isdigit (words[*offset])); + continue; + } - if (isalpha (words[*offset]) || special) - { - env = w_addchar (env, &env_length, &env_maxlen, - words[*offset]); - if (env == NULL) - goto no_space; + special = (strchr ("*@$", words[*offset]) != NULL + || isdigit (words[*offset])); - if (special && words[start] != '{') - goto envsubst; + if (!isalpha (words[*offset]) && !special) + /* Stop and evaluate, remembering char we stopped at */ + break; - /* Keep going (get next char) */ - break; - } + env = w_addchar (env, &env_length, &env_maxlen, + words[*offset]); + if (env == NULL) + goto no_space; - /* Stop and evaluate, remembering char we stopped at */ - --(*offset); - goto envsubst; - } + if (special) + { + if (brace) + ++*offset; + goto envsubst; } } /* End of input string -- remember to reparse the character that we stopped * at. */ +end_of_word: --(*offset); envsubst: @@ -1381,53 +1357,39 @@ envsubst: free (env); /* Each parameter is a separate word ("$@") */ - if (__libc_argv[0] == NULL) - { - /* This can happen if the application is started without any - parameter, not even a name. This is legal according to - POSIX since the giving parameters is only a "should" rule. */ - *word = __strdup (""); - *max_length = *word_length = 0; - } - else + if (__libc_argv[0] != NULL && __libc_argv[1] != NULL) { + /* Append first parameter to current word. */ int p; - for (p = 1; __libc_argv[p + 1]; p++) - { - char *copy = __strdup (__libc_argv[p]); - if (copy == NULL) - return WRDE_NOSPACE; - - error = w_addword (pwordexp, copy); - if (error) - { - free (copy); - return error; - } - } + *word = w_addstr (*word, word_length, max_length, __libc_argv[1]); + if (*word == NULL) + return WRDE_NOSPACE; - /* Last parameter becomes current word */ - if (__libc_argv[p]) + for (p = 1; __libc_argv[p]; p++) { + if (w_addword (pwordexp, *word)) + return WRDE_NOSPACE; *word = __strdup (__libc_argv[p]); + *max_length = *word_length = strlen (*word); if (*word == NULL) return WRDE_NOSPACE; - - *max_length = *word_length = strlen (*word); } } - + return 0; } value = getenv (env); - if (action != '\0' || remove != RP_NONE) + if (action != ACT_NONE) { switch (action) { - case 0: + case ACT_RP_SHORT_LEFT: + case ACT_RP_LONG_LEFT: + case ACT_RP_SHORT_RIGHT: + case ACT_RP_LONG_RIGHT: { char *p; char c; @@ -1441,9 +1403,9 @@ envsubst: if (value == NULL) break; - switch (remove) + switch (action) { - case RP_SHORT_LEFT: + case ACT_RP_SHORT_LEFT: for (p = value; p <= end; ++p) { c = *p; @@ -1459,7 +1421,7 @@ envsubst: break; - case RP_LONG_LEFT: + case ACT_RP_LONG_LEFT: for (p = end; p >= value; --p) { c = *p; @@ -1475,7 +1437,7 @@ envsubst: break; - case RP_SHORT_RIGHT: + case ACT_RP_SHORT_RIGHT: for (p = end; p >= value; --p) { if (fnmatch (pattern, p, 0) != FNM_NOMATCH) @@ -1487,7 +1449,7 @@ envsubst: break; - case RP_LONG_RIGHT: + case ACT_RP_LONG_RIGHT: for (p = value; p <= end; ++p) { if (fnmatch (pattern, p, 0) != FNM_NOMATCH) @@ -1500,13 +1462,13 @@ envsubst: break; default: - assert (! "Unexpected `remove' value\n"); + break; } break; } - case '?': + case ACT_NULL_ERROR: if (value && *value) /* Substitute parameter */ break; @@ -1519,9 +1481,6 @@ envsubst: return 0; } - /* Error - exit */ - fprintf (stderr, "%s: ", env); - if (*pattern) { /* Expand 'pattern' and write it to stderr */ @@ -1533,9 +1492,11 @@ envsubst: { int i; + fprintf (stderr, "%s:", env); + for (i = 0; i < we.we_wordc; ++i) { - fprintf (stderr, "%s%s", i ? " " : "", we.we_wordv[i]); + fprintf (stderr, " %s", we.we_wordv[i]); } fprintf (stderr, "\n"); @@ -1548,12 +1509,12 @@ envsubst: return error; } - fprintf (stderr, "parameter null or not set\n"); + fprintf (stderr, "%s: parameter null or not set\n", env); free (env); free (pattern); return WRDE_BADVAL; - case '-': + case ACT_NULL_SUBST: if (value && *value) /* Substitute parameter */ break; @@ -1577,11 +1538,15 @@ envsubst: /* No field-splitting is allowed, so imagine quotes around the word. */ char *qtd_pattern = malloc (3 + strlen (pattern)); - sprintf (qtd_pattern, "\"%s\"", pattern); + if (qtd_pattern) + sprintf (qtd_pattern, "\"%s\"", pattern); free (pattern); pattern = qtd_pattern; } + if (pattern == NULL && (pattern = __strdup("")) == NULL) + goto no_space; + error = wordexp (pattern, &we, flags); if (error) { @@ -1606,7 +1571,7 @@ envsubst: goto no_space; } - if (action == '=') + if (action == ACT_NULL_ASSIGN) { char *words; char *cp; @@ -1634,7 +1599,7 @@ envsubst: return 0; } - case '+': + case ACT_NONNULL_SUBST: if (value && *value) goto subst_word; @@ -1646,7 +1611,7 @@ envsubst: free (pattern); return 0; - case '=': + case ACT_NULL_ASSIGN: if (value && *value) /* Substitute parameter */ break; @@ -1818,8 +1783,17 @@ parse_dollars (char **word, size_t *word_length, size_t *max_length, { /* Differentiate between $((1+3)) and $((echo);(ls)) */ int i = 3 + *offset; - while (words[i] && words[i] != ')') - ++i; + int depth = 0; + while (words[i] && !(depth == 0 && words[i] == ')')) + { + if (words[i] == '(') + ++depth; + else if (words[i] == ')') + --depth; + + ++i; + } + if (words[i] == ')' && words[i + 1] == ')') { (*offset) += 3; |