C
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Why this exists Almost every tool you write reads text it did not create: a port number from the command line, a line of a config file, a field in a log. That text can be empty, too long, half a number, or plain wrong.…
C Basics: Parsing Text Safely with strtol, Trimming, Splitting and a key=value Config
Turn text into numbers and settings without trusting it: why atoi is unsafe, how strtol reports errors, trimming and splitting in place, and a small config-file reader that tells the user which line is wrong.
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