Todas las librerias estandar en C & sus funciones

Encontré esto en internet, puede ser de muchísima ayuda para cualquier programador. puedes descargar un versión pdf (muy extensa) desde aquí 

Librerias ANSI C

string.h  cstring

Funciones disponibles: memchr, memcmp, memcpy, memmove, memset, strcat, strchr, strcmp, strcoll, strcpy, strcspn, strerror, strlen, strncat, strncmp, strncpy, strpbrk, strrchr, strspn, strstr, strtok, strxfrm, 

math.h   cmath

Funciones disponibles: acos, asin, atan, atan2, ceil, cos, cosh, exp, fabs, floor, fmod, frexp, ldexp, log, log10, modf, pow, sin, sinh, sqrt, tan, tanh, 

stdio.h    cstdio

Funciones disponibles: clearerr, fclose, feof, ferror, fflush, fgetc, fgetpos, fgets, fopen, fprintf, fputc, fputs, fread, freopen, fscanf, fseek, fsetpos, ftell, fwrite, getc, getcha, gets, perror, printf, putc, putchar, puts, remove, rename, rewind, scanf, setbuf, setvbuf, sprintf, sscanf, tmpfile, tmpnam, ungetc, vfprintf, vprintf, vsprintf,  

time.h     ctime

Funciones disponibles: asctime, clock, ctime, difftime, gmtime, localtime, mktime, strftime, time,

stdlib.h   cstdlib

Funciones disponibles: abort, abs, atexit, atof, atoi, atol, bsearch, calloc, div, exit, free, getenv, labs, ldiv, malloc, mble, mbstowcs, mbtowc, qsort, rand, realloc, srand, strtod, strtol, strtoul, system, wctomb,  

ctype.h   cctype

Funciones disponibles: tolower, toupper,  

locale.h  clocale

Funciones disponibles: localeconv, setlocale,  

signal.h  csignal

Funciones disponibles: raise, signal,  

setjmp.h csetjmp

Funciones disponibles: longjmp, setjmp,

Librerias Borland

conio.h

Funciones disponibles: cgets, clreol, clrscr, cprintf, cputs, cscanf, delline, getch, getche, getpass, gettext, gettextinfo, gotoxy, highvideo, inport, insline, kbhit, lowvideo, movetext, normvideo, outport, putch, puttext, textattr, textbackground, textcolor, textmode, ungetch, wherex, wherey, window, _setcursortype,

graphics.h 

Funciones disponibles: arc, bar, bar3d, circle, cleardevice, clearviewport, closegraph, detectgraph, drawpoly, ellipse, fillellipse, fillpoly, floodfill, getarccoords, getaspectratio, getbkcolor, getcolor, getdefaultpalette, getdrivername, getfillpattern, getfillsettings, getgraphmode, getimage, getlinesettings, getmaxcolor, getmaxmode, getmaxx, getmaxy, getmodename, getmoderange, getpalette, getpalettesize, getpixel, gettextsettings, getviewsettings, getx, gety, graphdefaults, grapherrormsg, graphresult, imagesize, initgraph, installuserdriver, installuserfont, line, linerel, lineto, moverel, moveto, outtext, outtextxy, pieslice, putimage, putpixel, rectangle, registerbgidriver, registerbgifont, restorecrtmode, sector, setactivepage, setallpalette, setaspectratio, setbkcolor, setfillpattern, setfillstyle, setgraphbufsize, setgraphmode, setlinestyle, setpalette, setrgbpalette, settextjustify, settextstyle, setusercharsize, setviewport, setvisualpage, setwritemode, textheight, textwidth, _graphfreemem, _graphgetmem,