espressif/ESP8266_RTOS_SDK
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ESP8266_RTOS_SDK/components/newlib
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Dong Heng e5df03c277 feat(cjson): Add function to encode json number when "sprintf" not support float 
Newlib use nano mode as default. When enable nano mode, cjson use internal function to encode for float data.
Otherwise using "sprintf" to encode float data.
2018-10-15 09:50:24 +08:00
..
newlib
feat(sdk): Midify "__FILE__" to "__ESP_FILE__" for some components
2018-09-21 13:04:59 +08:00
component.mk
feat(newlib): Add newlib platform function
2018-05-14 14:30:42 +08:00
Kconfig
feat(cjson): Add function to encode json number when "sprintf" not support float
2018-10-15 09:50:24 +08:00
Makefile.projbuild
feat(pthread): Modify for ESP8266
2018-09-13 15:34:54 +08:00
README.md
doc(newlib): Add doc for newlib
2018-05-18 16:55:50 +08:00

README.md

The newlib version has been updated to "2.2.0" and supply two version C libraries to user. One is "libc.a" which functions have more features base on stand C, another is "libc_nano.c" which functions have less function.

You can choose the one you needed by menuconfig:

Component config --->
        newlib --- >
                newlib level(XXXX)
                        ( ) normal
                        ( ) nano

The normal "libc" has position argument, "long long" type data and float data transformation at function printf/scanf and so on. So it should cost more stack and heap, the test data as following:
Object Origin newlib New newlib New newlib nano
Start heap/byte 53000 Start heap/byte 49184 Start heap/byte 51824
Fucntion Stack/byte Heap/byte Heap cost/byte Stack/byte Heap/byte Heap cost/byte Stack/byte Heap/byte Heap cost/byte
isalnum 96 53000 0 80 49184 0 80 51824 0
isalpha 80 53000 0 64 49184 0 64 51824 0
isspace 80 53000 0 64 49184 0 64 51824 0
atoi 160 53000 0 144 49184 0 144 51824 0
strtol 144 53000 0 128 49184 0 128 51824 0
atof 224 53000 0 208 49184 0 208 51824 0
atoff 224 53000 0 208 49184 0 208 51824 0
strtod 208 53000 0 192 49184 0 192 51824 0
strtof 208 53000 0 192 49184 0 192 51824 0
asprintf 880 52616 384 1200 48800 384 608 51632 192
sscanf 1552 53000 0 2032 49184 0 1120 51824 0
gmtime 944 52616 384 1040 48576 608 1296 51512 312
localtime 160 53000 0 288 49184 0 288 51824 0
mktime 320 53000 0 448 49184 0 448 51824 0
asctime 768 52488 480 1264 48528 656 752 51464 360
settimeofday 336 53000 0 320 49184 0 320 51824 0
gettimeofday 480 53000 0 464 49184 0 464 51824 0
localtime_r 304 53000 0 432 49184 0 432 51824 0
asprintf（64bit） 752 52424 576 1136 48336 848 608 51272 552
sscanf（64bit） 1056 53000 0 1376 49184 0 1040 51824 0