{"record":{"id":"bf2481c0db8b8b87","repo":"Yalantis/uCrop","slug":"cimg-appname-math-parser-cimg-s-s-s-too-m","errorCode":null,"errorMessage":"[cimg_appname_math_parser] CImg<%s>::%s: %s: Too much specified arguments (>24), in macro definition '%s()', in expression '%s'.","messagePattern":"\\[cimg_appname_math_parser\\] CImg<(.+?)>::(.+?): (.+?): Too much specified arguments \\(>24\\), in macro definition '(.+?)\\(\\)', in expression '(.+?)'\\.","errorType":"exception","errorClass":"CImgArgumentException","httpStatus":null,"severity":"error","filePath":"ucrop/src/main/jni/CImg.h","lineNumber":18587,"sourceCode":"                ++s; while (*s && cimg::is_blank(*s)) ++s;\n                CImg<charT>(s,(unsigned int)(se - s + 1)).move_to(macro_body,0);\n\n                bool is_variadic = false;\n                p1 = 1; // Index of current parsed argument\n                for (s = s0 + 1; s<=s1; ++p1, s = ns + 1) { // Parse function arguments\n                  if (is_variadic && p1>1) {\n                    _cimg_mp_strerr;\n                    cimg::strellipsize(variable_name,64);\n                    throw CImgArgumentException(\"[\" cimg_appname \"_math_parser] \"\n                                                \"CImg<%s>::%s: %s: Multiple arguments not allowed when first one is \"\n                                                \"variadic, in macro definition '%s()', in expression '%s'.\",\n                                                pixel_type(),_cimg_mp_calling_function,s_op,\n                                                variable_name._data,s0);\n                  }\n                  if (p1>24) {\n                    _cimg_mp_strerr;\n                    cimg::strellipsize(variable_name,64);\n                    throw CImgArgumentException(\"[\" cimg_appname \"_math_parser] \"\n                                                \"CImg<%s>::%s: %s: Too much specified arguments (>24), in macro \"\n                                                \"definition '%s()', in expression '%s'.\",\n                                                pixel_type(),_cimg_mp_calling_function,s_op,\n                                                variable_name._data,s0);\n                  }\n                  while (*s && cimg::is_blank(*s)) ++s;\n                  if (*s==')' && p1==1) break; // Function has no arguments\n                  s2 = s; // Start of the argument name\n                  is_sth = true; // is_valid_argument_name?\n                  if (*s2>='0' && *s2<='9') is_sth = false;\n                  else for (ns = s2; ns<s1 && *ns!=',' && *ns!='.' && !cimg::is_blank(*ns); ++ns)\n                         if (!cimg::is_varchar(*ns)) { is_sth = false; break; }\n                  s3 = ns; // End of the argument name\n                  if (is_sth && ns>s2 && *ns=='.' && ns[1]=='.' && ns[2]=='.') { is_variadic = true; ns+=3; }\n                  else if (*ns=='.') is_sth = false;\n                  while (*ns && cimg::is_blank(*ns)) ++ns;\n\n                  if (!is_sth || s2==s3 || (*ns!=',' && ns!=s1)) {","sourceCodeStart":18569,"sourceCodeEnd":18605,"githubUrl":"https://github.com/Yalantis/uCrop/blob/f788b534b48c144edf786c8cddbf0e029e637804/ucrop/src/main/jni/CImg.h#L18569-L18605","documentation":"The CImg math parser supports user-defined macros with at most 24 formal arguments. During macro definition parsing, if more than 24 arguments are declared, it throws CImgArgumentException. This is a hard compile-time limit of the expression compiler.","triggerScenarios":"Defining a math-parser macro via 'name(arg1,...,arg25) = expression' (or via the 'mdef'/'macros' mechanisms) where p1, the argument count, exceeds 24.","commonSituations":"Auto-generating macro definitions from data or code, porting huge formulas into CImg expressions, or copy-pasting long macro parameter lists.","solutions":["Reduce the number of macro arguments to 24 or fewer","Split the macro into two smaller macros and compose them","Precompute parts of the formula outside the math expression","Inline the formula at call sites instead of using a macro"],"exampleFix":"// before\nmyfunc(a1,...,a25) = a1+a2+...+a25;\n// after\nmyfunc(a1,...,a24) = a1+...+a24;  // split into two macros if more needed","handlingStrategy":"validation","validationCode":"const MAX_MACRO_ARGS = 24;\nfunction checkMacroArgCount(expr) {\n  const m = expr.match(/^\\s*\\w+\\s*\\(([^)]*)\\)\\s*=/);\n  if (!m) return;\n  const n = m[1].split(',').filter(s => s.trim() !== '').length;\n  if (n > MAX_MACRO_ARGS) throw new Error(`Macro has ${n} args; CImg allows max ${MAX_MACRO_ARGS}`);\n}\n","typeGuard":null,"tryCatchPattern":"try {\n  img.evaluate(expr);\n} catch (e) {\n  if (/Too much specified arguments \\(>24\\)/.test(String(e))) {\n    // refactor macro into smaller macros\n  } else throw e;\n}\n","preventionTips":["Keep macro signatures at or below 24 parameters","Compose small macros instead of one mega-macro","Unit-test macro definitions with a parser sanity check"],"tags":["cimg","math-parser","macro-definition","argument-limit"],"backgroundTag":"argument-out-of-range","analyzedSha":"f788b534b48c144edf786c8cddbf0e029e637804","analyzedAt":"2026-09-08T08:36:04.887Z","contentChangedAt":"2026-09-08T08:36:04.887Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}