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-rw-r--r--lib/libdtrace/common/dt_string.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/lib/libdtrace/common/dt_string.c b/lib/libdtrace/common/dt_string.c
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License"). You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident "%Z%%M% %I% %E% SMI"
+
+#include <strings.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include <dt_string.h>
+
+/*
+ * Create a copy of string s, but only duplicate the first n bytes.
+ */
+char *
+strndup(const char *s, size_t n)
+{
+ char *s2 = malloc(n + 1);
+
+ (void) strncpy(s2, s, n);
+ s2[n] = '\0';
+ return (s2);
+}
+
+/*
+ * Transform string s inline, converting each embedded C escape sequence string
+ * to the corresponding character. For example, the substring "\n" is replaced
+ * by an inline '\n' character. The length of the resulting string is returned.
+ */
+size_t
+stresc2chr(char *s)
+{
+ char *p, *q, c;
+ int esc = 0;
+ int x;
+
+ for (p = q = s; (c = *p) != '\0'; p++) {
+ if (esc) {
+ switch (c) {
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ c -= '0';
+ p++;
+
+ if (*p >= '0' && *p <= '7') {
+ c = c * 8 + *p++ - '0';
+
+ if (*p >= '0' && *p <= '7')
+ c = c * 8 + *p - '0';
+ else
+ p--;
+ } else
+ p--;
+
+ *q++ = c;
+ break;
+
+ case 'a':
+ *q++ = '\a';
+ break;
+ case 'b':
+ *q++ = '\b';
+ break;
+ case 'f':
+ *q++ = '\f';
+ break;
+ case 'n':
+ *q++ = '\n';
+ break;
+ case 'r':
+ *q++ = '\r';
+ break;
+ case 't':
+ *q++ = '\t';
+ break;
+ case 'v':
+ *q++ = '\v';
+ break;
+
+ case 'x':
+ for (x = 0; (c = *++p) != '\0'; ) {
+ if (c >= '0' && c <= '9')
+ x = x * 16 + c - '0';
+ else if (c >= 'a' && c <= 'f')
+ x = x * 16 + c - 'a' + 10;
+ else if (c >= 'A' && c <= 'F')
+ x = x * 16 + c - 'A' + 10;
+ else
+ break;
+ }
+ *q++ = (char)x;
+ p--;
+ break;
+
+ case '"':
+ case '\\':
+ *q++ = c;
+ break;
+ default:
+ *q++ = '\\';
+ *q++ = c;
+ }
+
+ esc = 0;
+
+ } else {
+ if ((esc = c == '\\') == 0)
+ *q++ = c;
+ }
+ }
+
+ *q = '\0';
+ return ((size_t)(q - s));
+}
+
+/*
+ * Create a copy of string s in which certain unprintable or special characters
+ * have been converted to the string representation of their C escape sequence.
+ * For example, the newline character is expanded to the string "\n".
+ */
+char *
+strchr2esc(const char *s, size_t n)
+{
+ const char *p;
+ char *q, *s2, c;
+ size_t addl = 0;
+
+ for (p = s; p < s + n; p++) {
+ switch (c = *p) {
+ case '\0':
+ case '\a':
+ case '\b':
+ case '\f':
+ case '\n':
+ case '\r':
+ case '\t':
+ case '\v':
+ case '"':
+ case '\\':
+ addl++; /* 1 add'l char needed to follow \ */
+ break;
+ case ' ':
+ break;
+ default:
+ if (c < '!' || c > '~')
+ addl += 3; /* 3 add'l chars following \ */
+ }
+ }
+
+ if ((s2 = malloc(n + addl + 1)) == NULL)
+ return (NULL);
+
+ for (p = s, q = s2; p < s + n; p++) {
+ switch (c = *p) {
+ case '\0':
+ *q++ = '\\';
+ *q++ = '0';
+ break;
+ case '\a':
+ *q++ = '\\';
+ *q++ = 'a';
+ break;
+ case '\b':
+ *q++ = '\\';
+ *q++ = 'b';
+ break;
+ case '\f':
+ *q++ = '\\';
+ *q++ = 'f';
+ break;
+ case '\n':
+ *q++ = '\\';
+ *q++ = 'n';
+ break;
+ case '\r':
+ *q++ = '\\';
+ *q++ = 'r';
+ break;
+ case '\t':
+ *q++ = '\\';
+ *q++ = 't';
+ break;
+ case '\v':
+ *q++ = '\\';
+ *q++ = 'v';
+ break;
+ case '"':
+ *q++ = '\\';
+ *q++ = '"';
+ break;
+ case '\\':
+ *q++ = '\\';
+ *q++ = '\\';
+ break;
+ case ' ':
+ *q++ = c;
+ break;
+ default:
+ if (c < '!' || c > '~') {
+ *q++ = '\\';
+ *q++ = ((c >> 6) & 3) + '0';
+ *q++ = ((c >> 3) & 7) + '0';
+ *q++ = (c & 7) + '0';
+ } else
+ *q++ = c;
+ }
+
+ if (c == '\0')
+ break; /* don't continue past \0 even if p < s + n */
+ }
+
+ *q = '\0';
+ return (s2);
+}
+
+/*
+ * Return the basename (name after final /) of the given string. We use
+ * strbasename rather than basename to avoid conflicting with libgen.h's
+ * non-const function prototype.
+ */
+const char *
+strbasename(const char *s)
+{
+ const char *p = strrchr(s, '/');
+
+ if (p == NULL)
+ return (s);
+
+ return (++p);
+}
+
+/*
+ * This function tests a string against the regular expression used for idents
+ * and integers in the D lexer, and should match the superset of RGX_IDENT and
+ * RGX_INT in dt_lex.l. If an invalid character is found, the function returns
+ * a pointer to it. Otherwise NULL is returned for a valid string.
+ */
+const char *
+strbadidnum(const char *s)
+{
+ char *p;
+ int c;
+
+ if (*s == '\0')
+ return (s);
+
+ errno = 0;
+ (void) strtoull(s, &p, 0);
+
+ if (errno == 0 && *p == '\0')
+ return (NULL); /* matches RGX_INT */
+
+ while ((c = *s++) != '\0') {
+ if (isalnum(c) == 0 && c != '_' && c != '`')
+ return (s - 1);
+ }
+
+ return (NULL); /* matches RGX_IDENT */
+}
+
+/*
+ * Determine whether the string contains a glob matching pattern or is just a
+ * simple string. See gmatch(3GEN) and sh(1) for the glob syntax definition.
+ */
+int
+strisglob(const char *s)
+{
+ char c;
+
+ while ((c = *s++) != '\0') {
+ if (c == '[' || c == '?' || c == '*' || c == '\\')
+ return (1);
+ }
+
+ return (0);
+}
+
+/*
+ * Hyphenate a string in-place by converting any instances of "__" to "-",
+ * which we use for probe names to improve readability, and return the string.
+ */
+char *
+strhyphenate(char *s)
+{
+ char *p, *q;
+
+ for (p = s, q = p + strlen(p); p < q; p++) {
+ if (p[0] == '_' && p[1] == '_') {
+ p[0] = '-';
+ bcopy(p + 2, p + 1, (size_t)(q - p) - 1);
+ }
+ }
+
+ return (s);
+}
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