nasmlib: introduce string helpers

To make code more compact we introduce the
following string helpers:

1) nasm_scip_spaces - skip leading spaces
2) nasm_skip_word - skip leading non-spaces
3) nasm_zap_spaces - zap leading spaces with zero
4) nasm_zap_spaces_rev - zap spaces in reverse order

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

diff --git a/nasmlib.c b/nasmlib.c
index 35aa505..79935ad 100644 (file)
--- a/nasmlib.c
+++ b/nasmlib.c
@@ -653,3 +653,39 @@ char *nasm_strcat(const char *one, const char *two)
     strcpy(rslt + l1, two);
     return rslt;
 }
+
+/* skip leading spaces */
+char *nasm_skip_spaces(const char *p)
+{
+    if (p)
+        while (*p && nasm_isspace(*p))
+            p++;
+    return (char *)p;
+}
+
+/* skip leading non-spaces */
+char *nasm_skip_word(const char *p)
+{
+    if (p)
+        while (*p && !nasm_isspace(*p))
+            p++;
+    return (char *)p;
+}
+
+/* zap leading spaces with zero */
+char *nasm_zap_spaces(char *p)
+{
+    if (p)
+        while (*p && nasm_isspace(*p))
+            *p++ = 0x0;
+    return p;
+}
+
+/* zap spaces with zero in reverse order */
+char *nasm_zap_spaces_rev(char *p)
+{
+    if (p)
+        while (*p && nasm_isspace(*p))
+            *p-- = 0x0;
+    return p;
+}

diff --git a/nasmlib.h b/nasmlib.h
index 441ea20..f3128b5 100644 (file)
--- a/nasmlib.h
+++ b/nasmlib.h
@@ -377,6 +377,11 @@ int src_get(int32_t *xline, char **xname);
 
 char *nasm_strcat(const char *one, const char *two);
 
+char *nasm_skip_spaces(const char *p);
+char *nasm_skip_word(const char *p);
+char *nasm_zap_spaces(char *p);
+char *nasm_zap_spaces_rev(char *p);
+
 const char *prefix_name(int);
 
 #define ZERO_BUF_SIZE 4096