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https://github.com/ibm-s390-linux/s390-tools.git
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aa29a5f1f9
Add util_startswith to util_str to check if a string starts with the given prefix and returns a pointer to the rest of the string, or NULL if it does not. Signed-off-by: Wisdom Erhimwionsobo <werh29@linux.ibm.com> Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com> Reviewed-by: Steffen Eiden <seiden@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/*
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* util - Utility function library
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*
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* Manipulate and work with strings
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*
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* Copyright IBM Corp. 2026
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <ctype.h>
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#include <string.h>
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#include "lib/util_panic.h"
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#include "lib/util_str.h"
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/**
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* Copy characters from \a src to \a dest, omitting all blank characters
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* (spaces and tabs). The resulting string in \a dest will be NUL terminated.
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*
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* @param[in] src Source string
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* @param[out] dest Destination buffer
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*/
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void util_str_rm_whitespace(const char *src, char *dest)
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{
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while (*src != '\0') {
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if (!isblank(*src)) {
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*dest = *src;
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dest++;
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}
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src++;
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}
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*dest = '\0';
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}
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/**
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* Check if string \a s starts with \a prefix
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*
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* @param[in] s String to check
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* @param[in] prefix Prefix to match
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*
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* @returns Pointer to the character after the prefix if match is found,
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* NULL otherwise
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*/
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const char *util_startswith(const char *s, const char *prefix)
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{
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size_t sz;
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util_assert(s != NULL, "Internal error: s input is NULL");
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util_assert(prefix != NULL, "Internal error: prefix input is NULL");
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sz = strlen(prefix);
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if (strncmp(s, prefix, sz) == 0)
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return s + sz;
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return NULL;
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}
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/**
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* Check if string \a s starts with \a prefix (case-insensitive)
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*
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* @param[in] s String to check
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* @param[in] prefix Prefix to match (case-insensitive)
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*
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* @returns Pointer to the character after the prefix if match is found,
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* NULL otherwise
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*/
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const char *util_startswith_no_case(const char *s, const char *prefix)
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{
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size_t sz;
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util_assert(s != NULL, "Internal error: s input is NULL");
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util_assert(prefix != NULL, "Internal error: prefix input is NULL");
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sz = strlen(prefix);
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if (strncasecmp(s, prefix, sz) == 0)
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return s + sz;
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return NULL;
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}
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