int op;
int current_level;
int level;
- int opcode;
+ int opcode = 0;
int pattern_offset = 0, alloc;
int starts[NUM_LEVELS * MAX_NESTING];
int starts_base;
/* Return matches */
for (i = 0; i < c; i++) {
- if (m[i].start == -1)
+ if (m[i].start == -1) {
+ silc_buffer_set(rets[i], NULL, 0);
continue;
+ }
silc_buffer_set(rets[i], (unsigned char *)string + m[i].start,
m[i].end - m[i].start);
}
return ret;
}
+
+/***************************** Substitution API *****************************/
+
+/* Regexp to parse sed substitution command syntax */
+#define SILC_REGEXP_SUBST \
+ "^(/?.+/?[^!s]|[0-9]+|\\$)?(!?s)(/)(.*[^\\])?(/)(.*[^\\])?(/)(!?.+)?"
+
+/* Substitution context */
+typedef struct {
+ SilcInt32 addr_number; /* Line number to match, -1 for last line */
+ SilcUInt32 line; /* Current line number */
+ char *str_regexp; /* REGEXP to match */
+ SilcBufferRegexFlags match_flags; /* Match flags */
+ SilcBufferRegexFlags addr_flags; /* ADDR flags */
+ SilcBuffer rep; /* REPLACEMENT */
+} SilcSubstContext;
+
+/* Function to check the ADDR match and do rest of the match and
+ substitution. */
+
+static int silc_subst_addr(SilcStack stack, SilcBuffer buffer, void *value,
+ void *context)
+{
+ SilcSubstContext *ctx = context;
+
+ ctx->line++;
+
+ /* If NUMBER was set in ADDR, match for specific line number */
+ if (ctx->addr_number > 0 && ctx->addr_number != ctx->line &&
+ !(ctx->addr_flags & SILC_STR_REGEX_NOT))
+ return 0;
+ if (ctx->addr_number > 0 && ctx->addr_number == ctx->line &&
+ ctx->addr_flags & SILC_STR_REGEX_NOT)
+ return 0;
+
+ /* Check for last line if ADDR was '$' */
+ if (buffer->tail != buffer->end && ctx->addr_number == -1 &&
+ !(ctx->addr_flags & SILC_STR_REGEX_NOT))
+ return 0;
+ if (buffer->tail == buffer->end && ctx->addr_number == -1 &&
+ ctx->addr_flags & SILC_STR_REGEX_NOT)
+ return 0;
+
+ /* Match and replace */
+ return silc_buffer_format(buffer,
+ SILC_STR_REGEX(ctx->str_regexp, ctx->match_flags),
+ SILC_STR_REPLACE(silc_buffer_data(ctx->rep) ?
+ silc_buffer_data(ctx->rep) :
+ (unsigned char *)"",
+ silc_buffer_len(ctx->rep)),
+ SILC_STR_END, SILC_STR_END);
+}
+
+/* Matching and substitution ala sed. */
+
+SilcBool silc_subst(SilcBuffer buffer, const char *subst)
+{
+ SilcSubstContext ctx;
+ SilcBufferStruct match, addr, command, exp_start, exp, exp_end;
+ SilcBufferStruct rep, rep_end, flags;
+ SilcBufferRegexFlags addr_flags = 0, match_flags = 0;
+ char *str_addr = "";
+ int ret = -1;
+
+ memset(&ctx, 0, sizeof(ctx));
+
+ if (!buffer || !subst) {
+ silc_set_errno(SILC_ERR_INVALID_ARGUMENT);
+ goto out;
+ }
+
+ SILC_LOG_DEBUG(("Substitution '%s'", subst));
+
+ /* Parse the expression syntax */
+ if (!silc_regex(subst, SILC_REGEXP_SUBST, &match, &addr, &command,
+ &exp_start, &exp, &exp_end, &rep, &rep_end, &flags, NULL)) {
+ silc_set_errno_reason(SILC_ERR_SYNTAX, "Invalid substitution expression");
+ goto out;
+ }
+
+ /* Check address syntax */
+ if (silc_buffer_len(&addr)) {
+ if (*silc_buffer_data(&addr) == '/') {
+ silc_buffer_pull(&addr, 1);
+ if (addr.tail[-1] != '/') {
+ silc_set_errno_reason(SILC_ERR_SYNTAX,
+ "Invalid address syntax, missing '/'");
+ goto out;
+ }
+ silc_buffer_push_tail(&addr, 1);
+
+ if (!silc_buffer_len(&addr)) {
+ silc_set_errno_reason(SILC_ERR_SYNTAX,
+ "Invalid address syntax, missing regular "
+ "expression");
+ goto out;
+ }
+ str_addr = silc_memdup(silc_buffer_data(&addr),
+ silc_buffer_len(&addr));
+
+ } else if (*silc_buffer_data(&addr) == '$' &&
+ silc_buffer_len(&addr) == 1) {
+ ctx.addr_number = -1;
+
+ } else if (isdigit((int)*silc_buffer_data(&addr))) {
+ ctx.addr_number = *silc_buffer_data(&addr) - '0';
+ silc_buffer_pull(&addr, 1);
+ while (silc_buffer_len(&addr) &&
+ isdigit((int)*silc_buffer_data(&addr))) {
+ ctx.addr_number *= 10;
+ ctx.addr_number += *silc_buffer_data(&addr) - '0';
+ silc_buffer_pull(&addr, 1);
+ }
+
+ if (silc_buffer_len(&addr)) {
+ silc_set_errno_reason(SILC_ERR_SYNTAX,
+ "Invalid address syntax, not a number");
+ goto out;
+ }
+
+ if (ctx.addr_number == 0) {
+ silc_set_errno_reason(SILC_ERR_SYNTAX,
+ "Invalid address syntax, line address is 0");
+ goto out;
+ }
+
+ } else {
+ silc_set_errno_reason(SILC_ERR_SYNTAX, "Unsupported address syntax");
+ goto out;
+ }
+ }
+
+ /* Check command syntax */
+ if (!silc_buffer_len(&command) || silc_buffer_len(&command) > 2) {
+ silc_set_errno_reason(SILC_ERR_SYNTAX, "Invalid commmand");
+ goto out;
+ }
+ if ((silc_buffer_len(&command) == 1 &&
+ !silc_buffer_memcmp(&command, "s", 1)) ||
+ (silc_buffer_len(&command) == 2 &&
+ !silc_buffer_memcmp(&command, "!s", 2))) {
+ silc_set_errno_reason(SILC_ERR_SYNTAX, "Invalid command");
+ goto out;
+ }
+ if (silc_buffer_len(&command) == 2)
+ addr_flags |= SILC_STR_REGEX_NOT;
+
+ /* Check REGEXP syntax */
+ if (!silc_buffer_len(&exp_start) ||
+ !silc_buffer_memcmp(&exp_start, "/", 1)) {
+ silc_set_errno_reason(SILC_ERR_SYNTAX,
+ "Invalid substitution syntax, missing '/'");
+ goto out;
+ }
+ if (!silc_buffer_len(&exp_end) ||
+ !silc_buffer_memcmp(&exp_end, "/", 1)) {
+ silc_set_errno_reason(SILC_ERR_SYNTAX,
+ "Invalid substitution syntax, missing '/'");
+ goto out;
+ }
+
+ /* Check FLAGS syntax */
+ if (silc_buffer_len(&flags)) {
+ if (silc_buffer_len(&flags) > 1) {
+ silc_set_errno_reason(SILC_ERR_SYNTAX, "Invalid flags");
+ goto out;
+ }
+
+ /* Check supported flags */
+ if (silc_buffer_len(&flags) == 1) {
+ if (silc_buffer_memcmp(&flags, "g", 1)) {
+ match_flags |= SILC_STR_REGEX_ALL;
+ } else {
+ silc_set_errno_reason(SILC_ERR_SYNTAX, "Unsupported flag");
+ goto out;
+ }
+ }
+ }
+
+ /* Set flags */
+ match_flags |= SILC_STR_REGEX_INCLUSIVE;
+ addr_flags |= SILC_STR_REGEX_NL | SILC_STR_REGEX_NO_ADVANCE;
+
+ ctx.str_regexp = silc_memdup(silc_buffer_data(&exp),
+ silc_buffer_len(&exp));
+ ctx.addr_flags = addr_flags;
+ ctx.match_flags = match_flags;
+
+ /* Unescape escapes from REPLACEMENT */
+ ctx.rep = silc_buffer_copy(&rep);
+ if (!ctx.rep)
+ goto out;
+ if (silc_buffer_len(ctx.rep))
+ silc_buffer_format(ctx.rep,
+ SILC_STR_REGEX("\\\\/", (SILC_STR_REGEX_ALL |
+ SILC_STR_REGEX_INCLUSIVE)),
+ SILC_STR_REPLACE("/", 1),
+ SILC_STR_END, SILC_STR_END);
+
+ /* If NUMBER or $ is specified, handle NOT flag in the silc_subst_addr */
+ if (ctx.addr_number)
+ addr_flags &= ~SILC_STR_REGEX_NOT;
+
+ SILC_LOG_DEBUG(("ADDR '%s' flags 0x%x, NUMBER %d", str_addr, addr_flags,
+ ctx.addr_number));
+ SILC_LOG_DEBUG(("REGEXP '%s' flags 0x%x", ctx.str_regexp, match_flags));
+
+ /* Match and replace */
+ ret = silc_buffer_format(buffer,
+ SILC_STR_REGEX(str_addr, addr_flags),
+ SILC_STR_FUNC(silc_subst_addr, NULL, &ctx),
+ SILC_STR_END, SILC_STR_END);
+
+ out:
+ if (str_addr && strlen(str_addr))
+ silc_free(str_addr);
+ silc_free(ctx.str_regexp);
+ silc_buffer_free(ctx.rep);
+
+ return ret >= 0 ? TRUE : FALSE;
+}
projects / silc.git / blobdiff