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Macros are frequently used in the remediation of existing code to globally replace one identifier with another, for example, when an existing API changes. While there is always some risk involved, this practice becomes particularly dangerous if a function name is replaced with the function name of a deprecated or obsolescent functions. Deprecated functions are defined by the C99 standard and Technical Corrigenda. Obsolescent functions are defined by this guideline.

Deprecated Functions

The gets() function was deprecated by Technical Corrigendum 3.

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The following functions are obsolescent.

`asctime()`	`atof()`	`atoi()`	`atol()`	`atoll()`	`bsearch()`	`ctime()`
`fopen()`	`fprintf()`	`freopen()`	`fscanf()`	`fwprintf()`	`fwscanf()`	`getenv()`
`gmtime()`	`localtime()`	`mbsrtowcs()`	`mbstowcs()`	`memcpy()`	`memmove()`	`printf()`
`qsort()`	`remove()`	`rename()`	`rewind()`	`setbuf()`	`snprintf()`	`sprintf()`
`sscanf()`	`strcat()`	`strcpy()`	`strerror()`	`strncat()`	`strncpy()`	`strtok()`
`swprintf()`	`swscanf()`	`tmpfile()`	`tmpfile_s()`	`tmpnam()`	`tmpnam_s()`	`vfprintf()`
`vfscanf()`	`vfwprintf()`	`vfwscanf()`	`vprintf()`	`vscanf()`	`vsnprintf()`	`vsprintf()`
`vsscanf()`	`vswprintf()`	`vswscanf()`	`vwprintf()`	`vwscanf()`	`wcrtomb()`	`wcscat()`
`wcscpy()`	`wcsncat()`	`wcsncpy()`	`wcsrtombs()`	`wcstok()`	`wcstombs()`	`wctomb()`
`wmemcpy()`	`wmemmove()`	`wprintf()`	`wscanf ()`

Noncompliant Code Example

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Deprecated Functions

Noncompliant Code Example