***:~ ***$ scan-build gcc -c ~/Downloads/raw.c
scan-build: Using '/opt/checker-276/bin/clang' for static analysis
/Users/***/Downloads/raw.c:215:34: warning: incompatible integer to pointer conversion passing 'int' to parameter of type 'const char *'
      [-Wint-conversion]
        dfdx[0] = strcmp(rt->fx, 'x') ? '1': '0';
                                 ^~~
/usr/include/string.h:77:39: note: passing argument to parameter here
int      strcmp(const char *, const char *);
                                          ^
1 warning generated.
/Users/***/Downloads/raw.c:96:20: warning: Potential leak of memory pointed to by 'betweenParens'
            result = buildTree(betweenParens);
            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/***/Downloads/raw.c:138:1: warning: Potential leak of memory pointed to by 'rightTraveler'
}
^
/Users/***/Downloads/raw.c:166:13: warning: Potential leak of memory pointed to by 'rootptr'
            printf("Could not parse expression. Stopped at index %d, character %c.\n", (int)(curptr-fstr), *curptr);
            ^~~~~~
/Users/***/Downloads/raw.c:192:18: warning: Potential leak of memory pointed to by 'dgdx'
            dfdx = strcat(dfdx, dgdx);
            ~~~~~^~~~~~~~~~~~~~~~~~~~
/Users/***/Downloads/raw.c:193:18: warning: Potential memory leak
            dfdx = strcat(dfdx, charToString(thisop));
            ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/***/Downloads/raw.c:194:18: warning: Potential leak of memory pointed to by 'dhdx'
            dfdx = strcat(dfdx, dhdx);
            ~~~~~^~~~~~~~~~~~~~~~~~~~
/Users/***/Downloads/raw.c:218:5: warning: Undefined or garbage value returned to caller
    return dfdx;
    ^~~~~~~~~~~
/Users/***/Downloads/raw.c:226:5: warning: Potential memory leak
    return 0;
    ^~~~~~~~
8 warnings generated.
scan-build: 8 bugs found.
scan-build: Run 'scan-view /var/folders/7w/dtxcnlxj2y73y8gwbx2zpxr80000gn/T/scan-build-2015-06-30-032135-14628-1' to examine bug reports.