invoice templateing work

1 files changed, 25 insertions, 0 deletions

diff --git a/src/strops.cpp b/src/strops.cpp
index 116eec4..3389eb1 100644
--- a/src/strops.cpp
+++ b/src/strops.cpp
@@ -32,4 +32,29 @@ char* strops_stristr(char* haystack, char* needle)
     }
   } while (*haystack++);
   return 0;
+}
+
+void strops_replace(char *buf, size_t buf_size, const char *search, const char *replace)
+{
+    size_t search_len = strlen(search);
+    size_t replace_len = strlen(replace);
+
+    char *r = buf; // read pointer
+    char *w = buf; // write pointer
+
+    while (*r && (w - buf) < (signed int)(buf_size - 1)) {
+        if (strncmp(r, search, search_len) == 0) {
+            // Ensure space
+            size_t remaining = buf_size - (w - buf) - 1;
+            size_t copy_len = (replace_len < remaining) ? replace_len : remaining;
+
+            memcpy(w, replace, copy_len);
+            w += copy_len;
+            r += search_len;
+        } else {
+            *w++ = *r++;
+        }
+    }
+
+    *w = '\0'; // terminate
 }
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